8 a) Suppose a sample of 30 ECC students are given an IQ test. If the sample has a standard deviation of 12.23 points, find a 90% confidence interval for the population standard deviation. b) If in the above scenario, a claim is made that the average monthly electric bill is $110. Would this claim be valid or invalid, based on the results of part (a)?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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8 a) Suppose a sample of 30 ECC students are given an IQ test. If the sample has a standard deviation of 12.23
points, find a 90% confidence interval for the population standard deviation.
b) If in the above scenario, a claim is made that the average monthly electric bill is $110. Would this
claim be valid or invalid, based on the results of part (a)?
Transcribed Image Text:8 a) Suppose a sample of 30 ECC students are given an IQ test. If the sample has a standard deviation of 12.23 points, find a 90% confidence interval for the population standard deviation. b) If in the above scenario, a claim is made that the average monthly electric bill is $110. Would this claim be valid or invalid, based on the results of part (a)?
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