**Undergraduate GPAs**It is desired to estimate the mean GPA of each undergraduate class at a large university. How large a sample is necessary to estimate the GPA within 0.21 at the 90% confidence level? The population standard deviation is 1.27. If needed, round your final answer up to the next whole number.The university needs at least a sample of [ ] students.

Given;population standard deviationσ=1.27margin of error = 0.21confidence level 90%

Answered: Undergraduate GPAs It is desired to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 40 home theater systems has a mean price of $124.00. Assume the population standard deviation is $19.60. Construct a 90% confidence interval for the population mean. The 90% confidence interval is (Round to two decimal places as needed.)
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