A random sample of n = 755 US cell phone users age 18 and older in May 2011 found that the average number of text messages sent or received per day is 41.5 messages, with standard error about 6.1. 1Smith, A., "Americans and Text Messaging," Pew Research Center, http://www.pewinternet.org/Reports/2011/Cell-Phone-Texting- 2011/Main-Report/How-Americans-Use-Text-Messaging.aspx, accessed September 19, 2011. Your answer is incorrect. (a) Use the information from the sample to give the best estimate of the population parameter. i eTextbook and Media Hint Your answer is incorrect. (b) Find a 95% confidence interval for the mean number of text messages. to The 95 % confidence interval is 70F Sunny
A random sample of n = 755 US cell phone users age 18 and older in May 2011 found that the average number of text messages sent or received per day is 41.5 messages, with standard error about 6.1. 1Smith, A., "Americans and Text Messaging," Pew Research Center, http://www.pewinternet.org/Reports/2011/Cell-Phone-Texting- 2011/Main-Report/How-Americans-Use-Text-Messaging.aspx, accessed September 19, 2011. Your answer is incorrect. (a) Use the information from the sample to give the best estimate of the population parameter. i eTextbook and Media Hint Your answer is incorrect. (b) Find a 95% confidence interval for the mean number of text messages. to The 95 % confidence interval is 70F Sunny
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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Question

Transcribed Image Text:A random sample of n = 755 US cell phone users age 18 and older in May 2011 found that the average number of text messages sent
or received per day is 41.5 messages, with standard error about 6.1.
1.
1Smith, A., "Americans and Text Messaging," Pew Research Center, http://www.pewinternet.org/Reports/2011/Cell-Phone-Texting-
2011/Main-Report/How-Americans-Use-Text-Messaging.aspx, accessed September 19, 2011.
Your answer is incorrect.
(a) Use the information from the sample to give the best estimate of the population parameter.
eTextbook and Media
Hint
Your answer is incorrect.
(b) Find a 95% confidence interval for the mean number of text messages.
to
The 95 % confidence interval is
70°F Sunny A
arch
立
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