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Estimate the standard deviation of iq scores

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Confidence interval for the population standard deviation

A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that IQ scores follow a normal distribution. Her random sample of 30 IQ scores has a mean of 102.3 and a standard deviation of 19.5 . Find the 90% confidence interval for the population standard deviation based on this sample. Then complete the table below. Need to find the upper and lower 90% CI. Please show all your work.

THanks a BUNCH!!!

Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places

Reference no: EM131180820

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