The scores on a placement test given to college freshmen for

The scores on a placement test given to college freshmen for the past five years are approximately normally distributed with a mean of 74 and a variance of 8. If a random sample of 20 students who take the placement test this year had a sample variance of 20, calculate the critical chi^2 statistic. Round answer to 3 decimal places.  

Solution

H0: s^2 = sigma^2

Ha\" s^2 not equals sigma^2

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chi square statistic = 42.5000