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TAT傲朋学习网

1、 One rule that must always be followed in constructing frequency distributions is that __.TAT傲朋学习网

A.adjacent classes must not overlapTAT傲朋学习网

B.the midpoint of each class must be a whole numberTAT傲朋学习网

C.the width of each class is equal to the rangeTAT傲朋学习网

D.the number of intervals must be an odd numberTAT傲朋学习网

正确答案：adjacent classes must not overlapTAT傲朋学习网

2、A.are established correctlyTAT傲朋学习网

B.are not mutually exclusivelyTAT傲朋学习网

C.are not collectively exhaustiveTAT傲朋学习网

D.don not reference a population parameterTAT傲朋学习网

正确答案：are not collectively exhaustiveTAT傲朋学习网

3、When a false null hypothesis is not rejected, the researcher has made aTAT傲朋学习网

A. type II error.TAT傲朋学习网

B. sampling error.TAT傲朋学习网

C.powerful error.TAT傲朋学习网

D. type I errorTAT傲朋学习网

正确答案： type II error.TAT傲朋学习网

4、A.TAT傲朋学习网

B.TAT傲朋学习网

C.TAT傲朋学习网

D.TAT傲朋学习网

正确答案：TAT傲朋学习网

5、Which of the following is an appropriate null hypothesis?TAT傲朋学习网

A.TAT傲朋学习网

B.TAT傲朋学习网

C.TAT傲朋学习网

D.TAT傲朋学习网

正确答案：TAT傲朋学习网

6、In what type of test is the variable of interest the difference between the values of the observations rather than the observations themselves?TAT傲朋学习网

A.a test for the equality of variances from 2 independent populationsTAT傲朋学习网

B.a test for the difference between the means of 2 related populationsTAT傲朋学习网

C.a test for the difference between the means of 2 independent populationsTAT傲朋学习网

D.All of the aboveTAT傲朋学习网

正确答案：All of the aboveTAT傲朋学习网

7、The test for the equality of two population variances is based on theTAT傲朋学习网

A.ratio of the two sample variancesTAT傲朋学习网

B.difference between the two sample variancesTAT傲朋学习网

C.difference between the two population variancesTAT傲朋学习网

D.difference between the sample variances divided by the difference between the sample meansTAT傲朋学习网

正确答案：ratio of the two sample variancesTAT傲朋学习网

8、A.zero.TAT傲朋学习网

B.-0.5.TAT傲朋学习网

C.0.5TAT傲朋学习网

D.one.TAT傲朋学习网

正确答案：0.5TAT傲朋学习网

9、A.t distribution with 73 degrees of freedomTAT傲朋学习网

B. t distribution with 72 degrees of freedom.TAT傲朋学习网

C.t distribution with 71 degrees of freedomTAT傲朋学习网

D. t distribution with 70 degrees of freedom.TAT傲朋学习网

正确答案： t distribution with 70 degrees of freedom.TAT傲朋学习网

10、A.TAT傲朋学习网

B.TAT傲朋学习网

C.TAT傲朋学习网

D.TAT傲朋学习网

正确答案：TAT傲朋学习网

1、Given the following information:Standard deviation = 8 Coefficient of variation = 64%The mean would then beTAT傲朋学习网

A.12.5TAT傲朋学习网

B. 8TAT傲朋学习网

C.0.64TAT傲朋学习网

D.1.25TAT傲朋学习网

正确答案：12.5TAT傲朋学习网

2、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 approximatelyTAT傲朋学习网