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Posted: **Wed May 11, 2022 2:02 pm**

: You Measure 40 Textbooks Weights And Find They Have A Mean Weight Of 30 Ounces Assume The Population Standard Deviatio 1 (24.92 KiB) Viewed 22 times

: You Measure 40 Textbooks Weights And Find They Have A Mean Weight Of 30 Ounces Assume The Population Standard Deviatio 2 (22.1 KiB) Viewed 22 times

You measure 40 textbooks weights, and find they have a mean weight of 30 ounces. Assume the population standard deviation is 9.4 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places < 4

A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 4% margin of error at a 90% confidence level, what size of sample is needed? Give your answer in whole people.