Statistics Worksheets

hapter 3, Section 2, Exercise 064

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,1 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.

(a) Use the information from the sample to give the best estimate of the population parameter. x¯= 

exact number, no tolerance

(b) Find a 95% confidence interval for the mean number of text messages. The 95% confidence interval is  to .

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