9.25 A statistics instructor is interested in the ability of students to assess the difficulty of a...

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9.25 A statistics instructor is interested in the ability of students to assess the difficulty of a test they have taken.

This test was taken by a large group of students, and the average score was 80.3. A random sample of eight students was asked to predict this average score. Their predictions were as follows:

77 88 73 61 62 79 97 75 Assuming a normal distribution, test the null hypothesis that the population mean prediction would be 80.3. Use a two-sided alternative and a 10% significance level.

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Essential Mathematics And Statistics For Science

ISBN: 9780470694480

2nd Edition

Authors: Graham Currell, Dr. Antony Dowman

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