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    Population Variance for Maintenance Supervisors

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    A maintenance supervisor is comparing the standard version of an instrunctional booklet with one that has claimed to be superior. The experiment is conducted in which 26 technicians are divided into two groups,provided with one of the booklets, then given a test a week later. For the 13 using the standard version, the average exam score was 72.0, with a standard deviation of9.3. For the 13 given the new version, the average score was 80.2, with a standard deviation of 10.1. Assuming normal population with equal standard deviations, and using the 0.05 level of significance, does the new booklet appear to be better than the standard version?

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    Solution Preview

    Null hypothesis:

    H0: There is no significant difference in variability between using the standard version and the new ...

    Solution Summary

    The solution determines the population variance for maintenance supervisors.