Question

select the correct answer.
an experiment is designed to compare the average salaries of employees in a particular position in two competing companies. the null hypothesis is assumed to be that there is no difference in the average salaries of employees in a particular position in the two companies. what is the alternative hypothesis?
a. there is a difference in the average salaries that is equal to the standard deviation.
b. there is no difference in the average salaries.
c. there is a difference in the average salaries.
d. the average salaries are equal.

Explanation:

The null hypothesis states there's no difference in average salaries. The alternative hypothesis is the opposite, so it should state there is a difference in average salaries. Option A introduces an unrelated concept (standard deviation), B and D are restating the null hypothesis. So C is correct.

Answer:

C. There is a difference in the average salaries.