WileyPLUS Statistics and Probability ques x Confidence Interval Calculator ? ) c

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WileyPLUS Statistics and Probability ques x Confidence Interval Calculator ? ) c Secure! https://edugen.wileyplus.com/edugen/lti/main.uni Lock, Statistics: Unlocking the Power of Data, 2e PRINTER VERSION BACK NEXT ASSIGNMENT RESOURCES Sum18-Assignment 5 Chapter 3 Section 1 Chapter 3, Section 2, Exercise 064 Number of Text Messages a Day A random sample of n755 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 A Chapter 3, section 1 Cha Chapter 3.Section 1 Smith, A., "Americans and Text Messaging," Pew Research Center, http://www.pewitenet.org/Reports/2011/Cell-Phone-Texting-2011/Main-Report/How-Americans-Use-Text-Messaging.aspx, accessed September 19, 2011 Exercise 029 Chapter 3 Section 2 Cha Chapter 3, Section 2 (a) Use the information from the sample to give the best estimate of the population parameter xercise 064 Chapter 3 Section 3 exact number. no tolerance Chapter 3 Section 3 ercise 0B6ad Chapter 3 Section 4 (b) Find a 95% confidence interval for the mean number of text messages. The 95% confidence interval is to Chapter 3 Section 4 Chaper 6,ection1 Ci. Question Attempts: 0 of 1 used SAVE FOR LATER SUBMIT ANSWER Chapter & Section 1-C powered by Review Score Review Resu Obisctive Study.

Explanation / Answer

Solutiona:

x bar=41.5

Solutionb:

95% confidence interval for mean is

sample mean-z*stderror,sample mean+z std error

z crit fro 95%=1.96

41.5-1.96*6.1,41.5+1.96*6.1

29.544,53.456

lower limit=29.544

upper limit=53.456

the 95% confidence interval is 29.544 to 53.456

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