Question

The manager of a computer software company wishes to study the number of hours senior executives by type of industry spend at their desktop computers. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of hours spent per week by industry?

Banking	Retail	Insurance
32	28	30
30	28	28
30	26	26
32	28	28
30	30	30

Answer 1

ANOVA:-

Analysis of Variance (ANOVA) is a statistical method used to test differences between two or more means. It may seem odd that the technique is called "Analysis of Variance" rather than "Analysis of Means." As you will see, the name is appropriate because inferences about means are made by analyzing variance.

Here, We use ONE WAY ANOVA

Banking	Retail	Insurance
32	28	30
30	28	28
30	26	26
32	28	28
30	30	30

Using MINITAB:

At the .05 significance level, she can conclude there is a difference in the mean number of hours spent per week by industry