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The scores on a placement test given to...
This question was answered on Mar 13, 2013. View the Answer
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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