The average score of a sample of 30 students on their second statistics examination was 85 with a standard deviation of 11 . Is the variance of the population significantly more than 80? Use a .05 level of significance
H0: ?2 ? 80
Ha: ?2 > 80
chi-square = 43.86 > 42.557 (p-value is between .025 and .05); reject H0
The population variance is significantly more than 80.
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