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The Mean Examination Score

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The historical mean of scholarship examination scores for freshman applications at a local university is 900. A historical population standard deviation of 180 is assumed known. Each year, the assistant dean uses a sample of applications to determine whether the mean examination score for the new freshman applications has changed. Use a 95% confidence interval. A sample of 200 applications provided a sample mean of 935.
Has the mean examination score for new freshman changed?

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Solution Summary

This is a comparison of the new and old mean examination scores for freshman applications at a local university.

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At Western University the historical mean of scholarship examination scores for freshman applications is 900. A historical population standard deviation of 180 is assumed known. Each year, the assistant dean uses a sample of applications to determine whether the mean examination score ...

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