554nbspa random sample of 20 students yielded a mean, Basic Statistics

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554nbspa random sample of 20 students yielded a mean

1. 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% con- ?dence interval for s2.

2. that s2= 1 is valid. Assume the population of battery lives to be approximately normally distributed.

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Basic Statistics: 554nbspa random sample of 20 students yielded a mean

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