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The scores on a placement test given to college freshmen for the past five years are approximately normally distributed with a mean μ = 74 and a variance σ2 = 8. Would you still consider σ2 = 8 to be a valid value of the variance if a random sample of 20 students who take the placement test this year obtain a value of s2 = 20?

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Thescoresonaplacementtestgiventocollege
freshmenforthepastfiveyearsareapproximatelynormally
distributedwithamean=74andavariance
2=8.Wouldyoustillconsider2=8tobeavalid...


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