A cell phone company would like to estimate the average number of text messages received by American teenagers per month. A random sample of52 teenaged customers were selected. The sample average was 2,279messages per month, and the sample standard deviation was 954messages per month. Construct confidence intervals with the given confidence levels. a.90%b.95%c.99%a. The 90% confidence interval has a lower limit of-------and an upper limit of--------.(Type integers or decimals rounded to one decimal place as needed.) b. The 95% confidence interval has a lower limit of------- and an upper limit of--------.(Type integers or decimals rounded to one decimal place as needed.) c. The 99% confidence interval has a lower limit of------- and an upper limit of--------.(Type integers or decimals rounded to one decimal place as needed.)

Name: A cell phone company would like to estimate the average number of text
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Description: A cell phone company would like to estimate the average number of text messages received by American teenagers per month. A random sample of52 teenaged customers were selected. The sample average was 2,279messages per month, and the sample standard

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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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A cell phone company would like to estimate the average number of text messages received by American teenagers per month. A random sample of

52 teenaged customers were selected. The sample average was 2,279

messages per month, and the sample standard deviation was 954
messages per month. Construct confidence intervals with the given confidence levels.

a.	90%
b.	95%
c.	99%

a. The 90% confidence interval has a lower limit of-------and an upper limit of--------.

(Type integers or decimals rounded to one decimal place as needed.)

b. The 95% confidence interval has a lower limit of------- and an upper limit of--------.

(Type integers or decimals rounded to one decimal place as needed.)

c. The 99% confidence interval has a lower limit of------- and an upper limit of--------.

(Type integers or decimals rounded to one decimal place as needed.)

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