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A psychologist wants to estimate the standard deviation of 1Q scores. It is widely believed that 1Q scores follow a normal distribution. Her random

 

A psychologist wants to estimate the standard deviation of 1Q scores. It is widely believed that 1Q scores follow a normal distribution. Her random sample of 25 1Q scores has a mean of 103.8 and a standard deviation of 12.9. Find the 95% confidence.interval for the population standard.deviation based on this sanple. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to at least two decamal places. (If necessary, contsult a lit of formulas.) LOwer limt: Upper limit:

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