In an article in the Journal of Management a study was condu

In an article in the Journal of Management, a study was conducted to compare work performance ratings for employees who stay in their organization and employees who voluntarily quit their jobs. The researchers were trying to determine whether employees who leave have higher performance ratings than those who stay. Based on the study, what would be the null hypothesis?

Select one:

a. of employees who leave – of employees who stay 0

b. of employees who leave – of employees who stay < 0

c. of employees who leave – of employees who stay 0

d. of employees who leave – of employees who stay = 0

If you are testing for differences between 7 population means:

Select one:

a. You would be performing a t-test

b. Your denominator degrees of freedom would be 7

c. Your sample size would be 7

d. Your numerator degrees of freedom would be 6

When testing for the difference between two population proportions, which of the following is NOT an essential piece of information needed to perform the test?

Select one:

a. Exactly what the population proportions are

b. The two sample sizes

c. The level of significance

d. All of the above are essential to perform the test

Solution

option d. of employees who leave – of employees who stay = 0

is correct.

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In this case we will use ANOVA. So numerator degree of freedom is k-1=7-1=6. So option (d) is correct.

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When testing for the difference between two population proportions, we do not need to know the population proportions. So option a is correct.