A random sample of 40 companies with assets over $10 million was selected and as

Question

A random sample of 40 companies with assets over $10 million was selected and asked for their annual computer technology expense and industry. The ANOVA comparing the average computer technology expense among three industries rejected the null hypothesis. The Mean Square Error (MSE) was 195. The following table summarized the results:

When comparing the mean annual computer technology expense for companies in the Education and Tax services industries, the following 95% confidence interval can be constructed:


Education Tax Service Food Service
Number Sample 10 14 16

Mean expense (1,000,000

Explanation / Answer

Solution:

Based on the comparison between the mean computer technology expense for companies in the Education and Tax services industries :

A confidence interval shows that the mean annual computer technology expenses are significantly different.

Answer: 13.5 ± 2.026 * 5.78

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