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Question 8:(5 points) A random sample of 20 students yielded a mean of x = 72

and a variance of s2

16 for scores on a college placement test in mathematics.

Assuming the scores to be normally distributed, construct a 98% confidence interval

for o2. (Suppose we know x6.01 = 36.191 and x0.99 = 7.633)

=

Fig: 1