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difference in the mean number of hours spent per week by industry

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The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. 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?

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The solution examines the difference in the mean number of hours spent per week by industry.

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