A random sample of 20 observations showed a standard deviation of 8 . At a 5% level of significance, test to see if the variance of the population is significantly less than 65
H0: ?2 ? 65
Ha: ?2 < 65 ?2 = 18.71 > 10.11; do not reject H0, there is not sufficient evidence to conclude that the variance of the population is significantly less than 65
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