3.54 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. (a) State the population and parameter of interest. Use the information from the sample to give the best estimate of the population parameter. (b) Find and interpret a 95% confidence interval for the mean number of text messages.
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Calculate the mean number of text messages sent and received per day among the 755 US cell phone users in May 2011. The average number of text messages sent and received per day is 41.5 messages. Show more…
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Sri K.
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. Smith, 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.
Joanna Q.
Question 17 The lengths of text messages are normally distributed with an unknown population mean. A random sample of text messages is taken and results in a 95% confidence interval of (23,47) characters. What is the correct interpretation of the 95% confidence interval? Select the correct answer below: A. We estimate that 95% of text messages have lengths between 23 and 47 characters. B. We estimate with 95% confidence that the true population mean is between 23 and 47 characters. C. We estimate with 95% confidence that the sample mean is between 23 and 47 characters
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