Items 6 through 10 refer to the following: An industrial psychologist wishes to

Question

Items 6 through 10 refer to the following:

An industrial psychologist wishes to study the effect of motivation on sales in a particular firm. 24 new salespersons are randomly divided into two groups of 12. One group is paid an hourly rate and the other group is only paid a commission. The sales volume (in thousands of dollars) is recorded for all 24 salespersons during the first month with the firm. The sample mean and standard deviation for the group paid hourly are 227.6 and 13.84, respectively. The sample mean and standard deviation for the commission group are 247.9 and 21.59, respectively. The psychologist is interested in finding evidence at the .05 significance level to support the notion that the incentive posed by offering a commission yields greater average sales volume.

Give the value of the appropriate test statistic.

1 points   

Which of the following correctly describes the p-value for the test statistic in #6?

1 points   

-2.101, 2.101

1 points   

What is the decision for the test statistic in #6?

Limburger cheese

1 points   

only values less than pi

only values less than cake

a)      only positive values

a)      both negative and positive values

Explanation / Answer

Question 6--b. 2.067

Question 7--c. .025 < p-value < .05

Question 8--d.-2.101, 2.101

Question 9--a.Do not reject H0

Question 10--e.a). both negative and positive values

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