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:

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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