The average grade of a sample of 25 students on their second statistics examination was 85 with a standard deviation of 9 . Is the variance of the population significantly more than 80? Use a .05 level of significance
H0: ?2 ? 80
Ha: ?2 > 80 ?2 = 24.3 < 36.41; do not reject H0, there is not sufficient evidence to conclude that the variance of the population is significantly more than 80
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