在双缝干涉实验中，为使屏上的干涉条纹间距变大，可以采取的办法是
penny bauer, chief financial officer of harrison haulage, suspects irregularities in the payroll system, and orders an inspection of ‘each and every payroll voucher issued since 1 january 2005’. five per cent of the payroll vouchers contained material errors. this is an example of ________________.
michael bayley, marketing director of unipower’s electrical division, is leading a study to identify and assess the relative importance of product features. michael directs his staff to design a survey questionnaire for distribution to all of unipower’s 954 customers. for this study, the set of 954 customers is a ________________.
claudia taylor, director of global industrial sales in melbourne, is concerned by a deteriorating sales trend. specifically, the number of customers is stable at 1500 but they are purchasing less each year. she orders her staff to search for causes of the downward trend by selecting a focus group of 40 industrial customers. for this study, the set of 40 industrial customers is a _______.
simon arnett, director of human resources, is exploring the causes of employee absenteei at buderim bottling during the last operating year (1 january 2005 to 31 december 2005). the average number of absences per employee, calculated from the personnel data of all employees, is a ___________________.
simon arnett, director of human resources, is exploring the causes of employee absenteei at buderim bottling during the last operating year (1 january 2005 to 31 december 2005). personnel records of 50 employees are selected for ysis. (the plant employs 250.) for this study, the average number days absent for these 50 employees is a ________________.
descriptive statistics deals with methods of
which of the following statements is not true?
which of the following is not the goal of descriptive statistics?
if data are grouped into intervals and the number of items in each group is listed, this could be called a _______________.
if the inidual class frequency is ided by the total frequency, the result is the __________.
a cumulative frequency polygon is also called _______________.
the number of class intervals in a frequency distribution is usually between ___________.
one advantage of a stem and leaf plot over a frequency distribution is that __________.
one rule that must always be followed in constructing frequency distributions is that ________.
which of the following is best to show the percentage of a total budget that is spent on each category of items?
a cumulative frequency distribution would provide _____________.
the number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed. class interval frequency 20-under 40 30 40-under 60 45 60-under 80 80 80-under 100 45 what is the cumulative frequency of the third class?
the number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed. class interval frequency 20-under 40 30 40-under 60 45 60-under 80 80 80-under 100 45 what is the approximate range of the number of phone calls arriving each hour?
simon arnett, director of human resources, is exploring employee absenteei at the buderim bottling during the last operating year. a sample of six personnel records produced the following data: 0, 2, 4, 7, 2, 9. the variance of the number absences per employee is ____________.
jessica salas, managing director of salas products, is reviewing the warranty policy for her company’s new model of car batteries. life tests performed on a sample of 100 batteries indicated: (1) an average life of 75 months, (2) a standard deviation of 5 months, and (3) battery life is approximately normally distributed. approximately 68% of the batteries will last between ________________.
the average starting salary for graduates at a university is $25,000 with a standard deviation of $2000. a histogram of the data shows the shape to be very erratic so chebyshev’s theorem should be used. how many of the graduates would have a starting salary between 21,000 and 29,000?
the sample standard deviation is found by taking the square root of _______.
the number of standard deviations that a value (x) is above or below the mean is the _______.
in a histogram, the proportion of the total area that must be to the left of the median is（ ）
which of the following is not a measure of central tendency?
another term for average is ____________.
if the mean of a distribution is greater than the median, then the distribution is ____________.
the mean is not affected by the extreme values.
a process that produces outcomes is called _______.
which of the following is not a legitimate probability value?
an outcome of an experiment is called _______.
the list of all elementary events for an experiment is called _______.
if a and b are mutually exclusive events with p(a) = 0.70, then p(b)：（ ）
if an event is in set x but is not in set y, which of the following is true?
if the occurrence of one event does not affect the occurrence of another event, then the two events are _______.
let a be the event that a student is enrolled in an accounting course, and let s be the event that a student is enrolled in a statistics course. it is known that 30% of all students are enrolled in an accounting course and 40% of all students are enrolled in statistics. included in these numbers are 15% who are enrolled in both statistics and accounting. find p(s).
given p(a) = 0.40, p(b) = 0.50, p(a b) = 0.15. which of the following is true?
variables which take on values only at certain points over a given interval are called _______.
a variable that can take on values at any point over a given interval is called _______.
you are offered an investment opportunity. its outcomes and probabilities are presented in the following table. x p(x) –$1000 .40 $0 .20 $1000 .40 the mean of this distribution is _____________.
you are offered an investment opportunity. its outcomes and probabilities are presented in the following table. x p(x) –$1000 .40 $0 .20 $1000 .40 the standard deviation of this distribution is _____________.
the long-run average or mean of a poisson distribution is usually referred to as _______.
the variance of a poisson distribution is equal to _______.
if x is a binomial random with n = 8 and p = 0.6, what is the probability that x is less than or equal to 2?
if x is a binomial random with n = 8 and p = 0.6, what is the probability that x is greater than 2?
twenty-five items are sampled. each of these has the same probability of being defective. the probability that exactly 2 of the 25 are defective could best be found by _______.
you are offered an investment opportunity. its outcomes and probabilities are presented in the following table. x p(x) –$1000 .40 $0 .20 $1000 .40 which of the following statements is true?
the normal distribution is an example of _______.
the total area underneath any normal curve is _______.
the area to the left of the mean in any normal distribution is _______.
for any normal distribution, any value less than the mean would have a _______.
a standardised normal distribution has the following characteristics:
if x is a normal random variable with mean 80 and standard deviation 5, calculate the z-score if x = 88.
suppose x is a normal random variable with mean 60 and standard deviation 2. a z-score was calculated for a number, and the z-score is 3.4. what is x?
let x be a normal random variable with mean 20 and standard deviation 4. find p(16 < x < 22).
let x be a normal random variable with mean 20 and standard deviation 4. the 90th percentile of x is ____________.
as a general rule, the normal distribution is used to approximate the sampling distribution of the sample mean only if
the eight employees of the art department and their ‘years of experience’ are listed in the following table. employee a b c d e f g h experience (years) 10 2 1 1 15 7 4 8 if a sample of three employees is selected with replacement, the number of elementary outcomes in the sample space is _______________.
a sampling distribution is a distribution of _______________.
the standard deviation of a sampling distribution is commonly called _______.
the central limit theorem states that if n is large enough, the distribution of the sample means is _____________ distributed regardless of the shape of the population.
increasing the sample size causes the standard error of the mean to ________.
increasing the sample size causes the sampling distribution of to ________.
suppose a population has a mean of 90 and a standard deviation of 28. if a random sample of size 49 is drawn from the population, the probability of drawing a sample with a mean of more than 95 is _______.
suppose 40% of all university students have a computer at home and a sample of 64 is taken. what is the probability that more than 30 of those in the sample have a computer at home?
when a range of values is used to estimate a population parameter, it is called _______.
catherine cho, director of marketing research at vitalglow pty ltd, is evaluating consumer acceptance of a new toothpaste package. her staff report that 17% of a random sample of 200 darwin households prefer the new package to all other package designs. if catherine concludes that 17% of all households prefer the new package, she is using a _______.
the z-value associated with a two-sided 90% confidence interval is _______.
suppose a random sample of 36 is selected from a population with a standard deviation of 12. if the sample mean is 98, the 99% confidence interval to estimate the population mean is _______.
sam gates, marketing director of mansfield motors’ electrical division, is leading a study to assess the relative importance of product features. an item on a survey questionnaire distributed to 121 mansfield customers asked them to rate the importance of ‘ease of maintenance’ on a scale of 1 to 10 (with 1 meaning ‘not important’ and 10 meaning ‘highly important’). his staff assembled the following statistics. ease of maintenance mean 7.5 population standard deviation 1.1 the 90% confidence interval for the population mean rating of ‘ease of maintenance’ is _____.
the t-distribution is similar to a normal distribution. however the t-distribution is _______.
in order to find values in the t- distribution table, you must convert the sample size or sizes to _______.
if the degrees of freedom in a t-distribution become very large, _______.
in finding a confidence interval for the population mean, the population standard deviation should be used if it is known. if the population standard deviation is not known, then it should be estimated with _______.
the first step in testing a hypothesis is to establish _______.
consider the following null and alternative hypotheses. ho: m <=7 ha: m > 6 these hypotheses _______________.
consider the following null and alternative hypotheses. ho: m >= 7 ha: m < 6 these hypotheses _______________.
consider the following null and alternative hypotheses. ho: £ 352 ha: > 352 these hypotheses _______________.
the region of the distribution in hypothesis testing in which the null hypothesis is rejected is called the _______.
the rejection and not rejectance regions are ided by a point called the _______.
the probability of committing a type ii error is represented by _______.
jennifer cantu, customer services manager at tri-nation auto insurance, monitors the claims processing time of the claims ision. her standard includes ‘a mean processing time of 5 days or less’. each week, her staff checks for compliance by ysing a random sample of 60 claims. jennifer’s alternative hypothesis is ________.
the manufacturers of a deodorant claim that the mean drying time of their product is, at most, 15 minutes. a sample consisting of 16 cans of the product was used to test the manufacturer’s claim. the experiment yielded a mean drying time of 18 minutes with a standard deviation of 6 minutes. test the claim at the 0.05 significance level.
what happens to the rejection region if the level of significance is changed from 0.10 to 0.05?
stefan irwin, marketing manager at classic merchandise, is investigating response rates to scented and unscented direct mail catalogues. if the response rate for the scented catalogue (population 1) is higher, mike will adopt the scented version. his staff randomly selects two samples of 200 each from the company’s customer database. one month after the 400 test catalogues were mailed, forty-five orders (twenty-five from the scented and twenty from the unscented) were received from the test catalogues. assuming a = .01, mike’s alternate hypothesis is ________________.
tamara hill, fund manager with hillcrest value fund, manages a portfolio of 250 common stocks. tamara is searching for a ‘low risk’ issue to add to the portfolio, i.e. one with a price variance less than that of the s&p 500 index. moreover, she assumes an issue is not ‘low risk’ until demonstrated otherwise. her staff reported that during the last nine quarters the price variance for the s&p 500 index (population 1) was 25, and for the last seven quarters the price variance for xyc common (population 2) was 8. assume that stock prices are normally distributed in the population. using a = 0.05, the appropriate decision is _______.
cindy ho, finance manager at red hill radiator supplies (rhrs), theorises that the discount level offered to credit customers affects the average collection period on credit sales. accordingly, she has designed an experiment to test her theory using four sales discount rates (0%, 2%, 4% and 6%) by randomly assigning five customers to each sales discount rate. an ysis of cindy’s data produced the following anova table. source of variation ss df ms f treatment 5.35 3 1.783333 error 177.2 16 11.075 total 182.55 19 using a = 0.01, the appropriate decision is _________.
for the same set of observations on a specified dependent variable, two different independent variables were used to develop 2 simple linear regression models. the results are summarized as follows: based on the above results, we can conclude that
the point estimate of the variance of the error term in a regression model is
in a regression problem, if the coefficient of determination is 0.95, this means that:
in regression ysis, the residuals represent the:
in the simple linear regression model, the population parameters of the y-intercept and the slope are estimated by:
if the standard error of estimate = 20 and n = 10, then the sum of squares for error, sse, is:
which of the following statistics and procedures can be used to determine whether a linear model should be employed?
丝绸之路，这个名称其实是由( )的地理学家李希霍芬片次提出。
古代陆上丝绸之路的主要运输工具是( )。
历史上的丝绸之路是通往( )著名的商路。
历史上的海上丝绸之路是从下列哪个地区出发的。( )
陆上丝绸之路，起自古代都城( )
加强政策沟通是“一带一路”建设的( )。
与俄罗斯、蒙古、吉尔吉斯斯坦、老挝、缅甸、（ ）六国实现电网互联互通。
2017年“一带一路”沿线64个对外贸易总额占全球贸易总额的（ ）。
资金融通是“一带一路”建设的( )。
与沿线的政策沟通主要体现在哪三个方面（ ）。
在宋元时期，海上丝绸之路发展至鼎盛时期，形成了东海航路和南海航路，其中，凭借其介于东海航路和南海航路之间的区位优势，成为了“世界最大港口之一”的是（ ）港。
下面哪个被誉为"海上马车夫"。（ ）
20世纪60、70年代世界经济格局发生变化，世界经济由一国独霸的局面开始向（ ）三足鼎立的局面过渡。
南巡讲话出现在当代的哪个阶段（ ）。
随着海上丝绸之路的开辟，在汉代就已经形成了五大港口格局，下列哪些属于这五大港口？（ ）
“一带一路”建设要推动口岸基础设施建设，畅通陆水联运通道，推进港口合作建设，增加 海上航线和班次，加强海上（ ）合作。
“一带一路”建设的优先领域是（ ）。
推进“一带一路”建设既是（ ）的需要，也是加强和亚欧及世界各国互利合作的需要。
（重庆）自由贸易试验区于（ ）获正式批复同意设立。
2010年新成立的我国第三个副省级新区是（ ）
民进蔡英文对“一带一路”无动于衷 ，提出（ ），并指该政策和“一带一路”是完全不同的模式，两者无交集。
亲民（ ），高度肯定并赞扬 “一带一路”高瞻远瞩，并呼吁台湾必须借大陆“一带一路”之“船”出“海”，台湾才有希望，否则台湾经济将很危险。
（ ）年10月底到12月初，海协会与台湾海基会在香港举行会谈，会谈后又通过数次函电往来，最终形成了“海峡两岸均坚持一个的原则”的共识，后被称为“九二共识”
大致认同或坚持民进主张的，被称为（ ）。
2017年“一带一路”国际合作高峰论坛召开时，台湾主流报纸对“一带一路”国际合作高峰论坛予以重点关注并大篇幅报道，主要有哪些台湾主流报纸（ ）
东亚金融危机不包括哪一个？
布雷顿森林体系的核心内容是美元与黄金挂钩，成员国货币和美元挂钩，实行可调整的固定汇率制度。
香港“占中”爆发在美联储宣布退出量化宽松政策以前（ ）
欧元正式诞生三个月之后针对欧元的（ ）战争爆发。
目前世界范围内使用最多的两种货币是：
第一个五年计划实施年份是（ ）
加入wto的时间是（ ）
tpp前身tpsep发起国是（ ）
“贸易战”正式打响的时间是（ ）
“改革开放”是指（ ）
战争后，国门打开，无需日本转口。为积累起巨额的原始资本，国际贸易成了日本的主要战略。
2014年7月平专程访问了韩国并在首尔大学发表讲演，提出共同打造利益共同体的建议和倡导合作发展理念。
中俄关系始终是国际关系中、举足轻重的组成部分，其走向直接决定亚太局势乃至世界格局。
在一带一路下，应进一步加强与各国的政策沟通，不断扩大彼此利益契合点。
日本主要的经济模式是（ ）。
格律诗的第一句可以选择入韵或不入韵。
平起不入韵谱式的五言诗，首两句的平仄应为“仄仄平平仄，平平仄仄平。”
排律可以在八句之后无限延长，延长时以六句为一个单元。
王勃的《送杜少府之任蜀川》是一首壮别诗，体现了初唐士人志存高远的精神风貌。
人们对自古以来已经定型、有固定形体规矩的经典诗词文体有多种称呼，以下哪个不是其称呼之一？
以下哪个不是王勃的作品？
以下哪些属于近体诗的格律要素？
一首律诗分为四联，分别称作
以下哪些人物属于“初唐四杰”？
以下哪些人物属于“吴中四士”？
被称为“七绝圣手”的是王之涣。
《逢入京使》一诗写于岑参首次前往西北边塞途中。
王昌龄的诗歌以（ ）居多。
岑参诗集名为：（ ）。
“烽火城西百尺楼”（王昌龄《从军行·其一》）的“烽火”，是指（ ）。
《临洞庭湖赠张丞相》一诗中，最有气象的一联是（ ）。
王维被称为（ ）。
《辋川集》是王维与（ ）的唱和的作品集。
与孟浩然交好的诗人有（ ）。
“惟有相思似春色，江南江北送君归”（王维《送沈子福归江东》）两句将相思之情寄托、附着自然景物上，与其写作手法相似的诗句有（ ）。
李白的遗稿是由他的儿子编纂成集的。
《长干行》一题原为长江下游一带的民歌，歌词内容多写船家妇女的生活和感情。
“绕床弄青梅”描绘了少男少女在卧室睡床边玩耍的情景。
《将进酒》原为汉乐府古题，内容多写朋友宴饮之事。
李白《将进酒》诠释了庄子的乐生哲学。
《饮中八仙歌》是李白的作品。
杜工部指的是
李白属于______诗人。
有关李白的《将进酒》，以下哪些表述是正确的？
以下哪些表述是正确的？
用诗歌来评论诗人、诗作的论诗诗这种文学批评形式源自白居易。
《西塞山怀古》是刘禹锡在朗州时候的作品。
“春风无限潇湘意”（柳宗元《酬曹侍御过象县见寄》）一句中的“潇湘意”，既有怀友之意，也有迁谪之意。
白居易十六岁去拜访顾况时，奉呈给顾况的诗作是（ ）。
“翰林江左日，员外剑南时”（白居易《读李杜诗集，因题卷后》）这一句中的“翰林”、“员外”分别指（ ）。
正式创作诗歌抒发哀悼之情的，始于（ ）。
《西塞山怀古》所怀之历史是（ ）。
古代诗歌多押平声韵，《元和韵谱》认为，平声的特点是（ ）韵。
对元稹怀念旧人的诗作，以下说确的有（ ）。
对“欲采蘋花不自由”（柳宗元《酬曹侍御过象县见寄》）一句的理解，正确的有（ ）。
李贺是没落的皇族后裔，常以“王孙、宗孙”自称。
李贺因韩愈《讳辩》得以继续参加科举。
李商隐以无题诗等爱情诗著称。
沈德潜称李商隐诗歌“对句用逆挽法”，逆挽是一种修辞手法。
“妾乘油壁车，郎骑青骢马”的《苏小小歌》属于______。
李商隐诗“空闻虎旅传宵柝，无复鸡人报晓筹。”中的“鸡人”是指？
杜牧出生于官宦世家，祖父______是中唐三朝宰相。
杜牧与______被合称为“小李杜”。
李商隐原籍怀州河内，号______，又号______。
李贺被称为“诗鬼”，他的诗歌风格是：
冯延巳的词作被《花间集》收录。
白居易《忆江南》词主要描写扬州的风物。
温庭筠与韦庄并称“温韦”，但两人词风有所区别。
李煜《虞美人》（春花秋月何时了）作于南唐灭亡以前。
以下表述正确的是？
以下表述错误的是？
以下哪首词作中没有出现闺阁女子的形象？
以下表述错误的是？
以下词作中，哪些创作于是暮春时节？
以下哪首词作中同时出现了花与月的意象？
晏几道号小晏
柳永是与晏殊同时的人
晏殊特别喜爱南唐（ ）词
欧阳修与晏殊同为（ ）人
晏几道词集名
选出与“手种堂前垂柳，别来几度春风”有异曲同工之妙的诗句：
一生仕途坎坷，五十岁左右才中进士的词人是
以下诗词句具有主人气概的有：
属于台阁词人的有
以下关于短韵的描述正确的是
秦观和苏轼都曾经被贬到黄州。
秦观是婉约风格的代表作家。
秦观词《踏莎行·郴州旅舍》写于仕途失意、忧愁困苦之时。
宋神宗支持王安石改革，苏轼受到重用。
《六州歌头》是汉唐鼓吹曲，声调和缓。
以下属于“苏门四学士”中的是：（ ）
苏轼把谁称为“山抹微云君”？（ ）
苏轼自称“出处老少，粗似乐天”，“乐天”是指：（ ）
“一川烟草，满城风絮，梅子黄时雨”，在修辞学上用了哪个手法？（ ）
以下哪些词人对苏轼学习作词造成过影响？（ ）
李清照《声声慢·寻寻觅觅》写于南渡之后。
李清照的父亲李格非为苏门四学士之一。
李清照的《词论》是词学史上第一篇论文。
李清照词《渔家傲·天接云涛连晓雾》上下两阕所表达的内容相互独立。
周邦彦《少年游》描写了一对恋人依依惜别的情景。
“美成词为可爱”中的“美成”是指：（ ）
据《樵隐笔录》记载：绍兴初，都下盛行周《_____》，西楼南瓦皆歌之，谓之《渭城三叠》（ ）
纳兰性德词“赌书消得泼茶香，当时只道是寻常”中的人物是指：（ ）
“以下不辨是情是景，但觉烟霭茫茫”，是针对哪一首词说的？（ ）
李清照词在靖康之变前的风格为：（ ）
以下哪些首作品不属于辛弃疾的豪气词？
下列选项中表述正确的一项是？
下列关于陆游《秋波媚》词的表述中，错误的是？
下列哪首词创作于陆游晚年？
张炎在《词源》中说，姜白石词不惟清空，又且骚雅，如（）孤飞，来去无迹。
下列词句中，哪一句与姜夔的《暗香》、《疏影》词描写的花相同？
以下词句中，哪一句的作者不是吴文英？
以下哪些词句能够表现辛弃疾不能实现报国之志的苦闷？
下列对姜夔“清空”词风的表述中，哪些是贴切的？
下列关于《三姝媚·过都城旧居有感》的表述中，哪些是错误的？
设p：我将去市里，q：我有时间．命题“我将去市里，仅当我有时间”符号化为
下列公式是重言式的为
下列表述成立的为
下列结论中不正确的是
设a，b都是命题公式，则a→b为可满足式是aþb的
一个公式在等价意义下，下面哪个写法是唯一的
下面4个推理定律中，不正确的是
下列语句中哪个是真命题
谓词公式$xa(x) ùø $xa(x)的类型是
设个体域为整数集，下列公式中其真值为1的是
下面给出的一阶逻辑等价式中，错误的是
下列关系中等价关系的是
下列命题中结论正确的是
下列关系矩阵所对应的关系具有反对称性的是
代数系统中若存在左幺元、右幺元，则左幺元，右幺元不一定相等.
一个代数系统中若存在左零元、右零元，则左零元，右零元一定相等。
一个代数系统中若存在左逆元、右逆元，则左逆元，右逆元必相等。
代数系统若存在单位元，则单位元是唯一的。
代数系统若存在单位元，零元则单位元必与零元相等。
独异点中的元素必有逆元.
独异点是含幺半群.
群必为半群.
群必为独异点.
群中并不是每个元素均有逆元.
群中无零元.
群和其子群共用一个单位元.
下面四组数不能构成无向图的度数列的
下列哪一种图不一定是树
统计学产生于（ ）
统计学产生于（ ）世纪。
研究者关心某总体的某些特征，但是因为总体太大，无法对每个个体进行测量，于是他就抽取部分个体即样本进行测量，然后根据样本数据对所研究的总体特征进行推断。此处，研究者所用的统计学研究方法为（ ）。
在没有对事物人为控制的条件下而得到的有关社会经济现象的统计数据属于（ ）。
研究如何对现象的数量特征进行计量、观察、概括和表述的理论和方法属于（ ）。
下列统计调查方法中，不能用来推断总体特征的有（ ）。
在问卷调查中，（ ）是在调查之前必须明确的。
在问卷设计中，（ ）指的是调查的具体内容。
通过《统计年鉴》获得数据，属于哪种统计方法。
查阅统计资料中的资料不包括（ ）。
下列可以用来描述数据集征的是（）。
存在一组数据 24 22 21 26 20，则此组数据的中位数为（ ）。
下列描述属于众数的是（ ）。
一组数据中最多只能存在一个（ ）。
下列属于对均值描述的有（）。
下列对相关与独立关系描述正确的有（ ）。
若总体分布为n（m,s2）,则n个样本平均数的分布为（ ）。
为了估计每分钟广告的平均费用，随机抽取16个电视台组成样本进行调查。调查结果样本的平均费用为2000元，标准差为1000元。假定所有被抽样的这类电视台的广告费用都近似服从正态分布，每分钟广告的平均费用的区间估计为（ ）。（取置信水平为0.05）
在对分类数据进行卡方检验时， 服从什么分布？（其中n表示类的个数）
对正态总体均值进行区间估计时，其它条件不变，置信水平 越小，则置信上限与置信下限的差（ ）
方差分析的模型假设包括（ ）。
因素的同一水平下样本数据的方差，叫做（）。
下列描述正确的是（ ）。
下列方法中，哪些方法可以用来检验不同总体是否满足方差齐性。
银行绩效评估是非常重要的管理问题，从两家银行在三个地区的抽查数据，要研究不同地区及不同银行之间绩效指标是否有显著差异，这需要运用（）。
圆的面积(s)与半径（r）之间的关系可表示为s = p r2则面积与半径之间的关系为（）。
下列属于对相关关系描述的是（）。
下列关系属于函数关系的是（）。
下列关系属于相关关系的是（）。
对于一元线性回归模型 y = b0 b1 x e， ε~n( 0 ,σ2 ) 下列表述正确的是（）。
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