MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Part 2 (b) Find a 95 % confidence interval for the mean number of text messages. The 95 % confidence interval is to eTextbook and Media Hint
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Transcribed Image Text:Part 2 (b) Find a 95 % confidence interval for the mean number of text messages. The 95 % confidence interval is to eTextbook and Media Hint
Number of Text Messages a Day 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. Part 1 Your answer is correct. (a) Use the information from the sample to give the best estimate of the population parameter. 41.5 eTextbook and Media Hint
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Transcribed Image Text:Number of Text Messages a Day 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. Part 1 Your answer is correct. (a) Use the information from the sample to give the best estimate of the population parameter. 41.5 eTextbook and Media Hint
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