精品资料欢迎阅读 智慧树知到商务统计见面课答案 智慧树知到商务统计见面课答案见面课：常见的假设检验及区间估计（双总体及多总体）1、问题: One rule that must always be followed in constructing frequency distributions is that _.选项：A:adjacent classes must not overlapB:the midpoint of each class must be a whole numberC:the width of each class is equal to the rangeD:the number of intervals must be an odd number答案: 【adjacent classes must not overlap】2、问题:image.png选项：A:are established correctlyB:are not mutually exclusivelyC:are not collectively exhaustiveD:don not reference a population parameter答案: 【are not collectively exhaustive】3、问题:When a false null hypothesis is not rejected, the researcher has made a选项：A: type II error.B: sampling error.C:powerful error.D: type I error答案: 【 type II error.】4、问题:image.png选项：A:image.pngB:image.pngC:image.pngD:image.png答案: 【image.png】5、问题:Which of the following is an appropriate null hypothesis?选项：A:image.pngB:image.pngC:image.pngD:image.png答案: 【image.png】6、问题:In what type of test is the variable of interest the difference between the values of the observations rather than the observations themselves?选项：A:a test for the equality of variances from 2 independent populationsB:a test for the difference between the means of 2 related populationsC:a test for the difference between the means of 2 independent populationsD:All of the above答案: 【All of the above】7、问题:The test for the equality of two population variances is based on the选项：A:ratio of the two sample variancesB:difference between the two sample variancesC:difference between the two population variancesD:difference between the sample variances divided by the difference between the sample means答案: 【ratio of the two sample variances】8、问题:image.png选项：A:zero.B:-0.5.C:0.5D:one.答案: 【0.5】9、问题:image.png选项：A:t distribution with 73 degrees of freedom B: t distribution with 72 degrees of freedom.C:t distribution with 71 degrees of freedomD: t distribution with 70 degrees of freedom.答案: 【 t distribution with 70 degrees of freedom.】10、问题:image.png选项：A:image.pngB:image.pngC:image.pngD:image.png答案: 【image.png】见面课：正确理解概率的含义及几种常见的概率统计分布1、问题:Given the following information:Standard deviation = 8 Coefficient of variation = 64%The mean would then be选项：A:12.5B: 8C:0.64D:1.25答案: 【12.5】2、问题:From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900. The standard error of the mean is approximately选项：A:1.1022B:2C:30D:1.4847答案: 【1.4847】3、问题:A sample of 400 observations will be taken from an infinite population. The population proportion equals 0.8. The probability that the sample proportion will be greater than 0.83 is选项：A:0.4332B: 0.9332C:0.0668D: 0.5668答案: 【0.0668】4、问题:A weighted average of the value of a random variable, where the probability function provides weights is known as选项：A:a probability functionB: a random variableC:the expected valueD:random function答案: 【the expected value】5、问题:The student body of a large university consists of 60% female students. A random sample of 8 students is selected. What is the probability that among the students in the sample exactly two are female?选项：A:0.0896B:0.2936C:0.0413D:0.0007答案: 【0.0413】6、问题:image.pngimage.png选项：A:1.431B:2.047C:3.05D: 21答案: 【1.431】7、问题:Exhibit 2 The following represents the probability distribution for the daily demand of computers at a local store.image.png选项：A:0.7B:0.3C:0.4D:1.0答案: 【0.7】8、问题: If A and B are independent events, then选项：A: P(A) must be equal to P(B)B:P(A) must be greater than P(B)C:P(A) must be less than P(B) D:P(A) must be equal to P(AB)答案: 【P(A) must be equal to P(AB)】9、问题:The purpose of statistical inference is to provide information about the选项：A:sample based upon information contained in the populationB:population based upon information contained in the sampleC:population based upon information contained in the populationD:mean of the sample based upon the mean of the population答案: 【population based upon information contained in the sample】10、问题:A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the选项：A:approximation theoremB:normal probability theoremC:central limit