The lengths of text messages are normally distributed with a population standard deviation of 3 characters and an unknownpopulation mean. If a random sample of 24 text messages is taken and results in a sample mean of 23 characters, find a98% confidence interval for the population mean. Round your answers to two decimal places.Z0.10 Zo.05 Zo.04 Zo.025 Zo.01 Zo.0051.282 1.645 1.751 1.960 2.326 2.576You may use a calculator or the common z-values above.Select the correct answer below:O (21.80, 24.20)O (21.99, 24.01)O (21.93, 24.07)O (22.21, 23.79)O (21.42, 24.58)O (21.58, 24.42)

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Answered: The lengths of text messages are…

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. From a random sample of 80 dates, the mean record high daily temperature in a certain city has a mean of 83.78°F. Assume the population standard deviation is 14.92°F. The 90% confidence interval is (enter your response here,enter your response here). (Round to two decimal places as needed.)
#3
You want to buy a washing machine, and a salesperson tells you that the mean repair costs for Model A and Model B are equal. You research the repair costs. The mean repair cost of 24 Model A washing machines is $209. Assume the population standard deviation is $20. The mean repair cost of 27 Model B washing machines is $215. Assume the population standard deviation is $24. At α=0.01, can you reject the salesperson's claim? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e). (a) Identify the claim and state H0 and Ha. What is the claim? A. The mean repair costs for Model A and Model B are equal. B. The mean repair cost for Model A is greater than Model B. C. The mean repair costs for Model A and Model B are different. D. The mean repair cost for Model A is less than Model B. Let μ1 be the mean repair cost for Model A and let μ2 be the mean repair cost for Model B.…
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