A sample of 16 students showed that the variance in the number of hours they spend studying is 25 . At a 5% level of significance, test to see if the variance of the population is significantly different from 30
H0: ?2 = 30
Ha: ?2 ? 30 ?2 = 12.5; do not reject H0
critical values: 6.26 and 27.49, there is not sufficient evidence to conclude that the variance is significantly different from 30
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