Question

does it make a difference which word-processing software you use? a random sample of 31 experienced secretaries were given the task of typing, proofreading and formatting a fifty-page document. 19 used word master software while the rest used super word software. the mean time required to produce the document using word master was 13 hr with standard deviation 1.7 hr. the mean time for the group using super word was 13.3 hr with standard deviation 1.9 hr. test the claim that there is a difference in the mean time using the two packages. use a 1% level of significance.

Answer 1

The null hypothesis assumes no difference in the mean time required for the two software packages, while the alternative hypothesis assumes a difference in mean time.

Step-by-step explanation:

In order to test the claim that there is a difference in the mean time required to produce a document using two word-processing software packages, we need to set up the null and alternative hypotheses.

The null hypothesis, denoted as H0, assumes that there is no difference in the mean time required for the two software packages. The alternative hypothesis, denoted as H1, assumes that there is a difference in the mean time required.

Since we are testing if the mean time for the two software packages is different, the alternative hypothesis will be two-sided. So, the null and alternative hypotheses are:

H0: μ1 - μ2 = 0 (No difference in mean time)

H1: μ1 - μ2 ≠ 0 (Difference in mean time)