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A study by a corporation revealed that the mean weekly salary for managers in department A...

A study by a corporation revealed that the mean weekly salary for managers in department A was $1,200 with a standard deviation of $100 (sample size = 64) while the mean weekly salary for managers in department B was $1350 and a standard deviation of $150 sample size = 81). The research department would like to prove that there is a difference between the mean weekly salaries between the two departments. A hypothesis test is to be conducted. What is the null hypothesis? Select one: a. H0 : .mu1 – mu2 > 0 b. H0 : mu1-mu2 not= 0 c. H0 : .mu1 – mu2 = 0 d. H0 : .mu1 – mu2 < 0

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