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Confidence Intervals AT&T is looking to attract more senior citizens and decided to start with evaluating...

Confidence Intervals

AT&T is looking to attract more senior citizens and decided to start with evaluating their use of text messaging to evaluate if it was worth the effort.  AT&T first wanted to estimate the average number of text messages per month.  A random sample of 60 senior citizens were selected and the average was surprisingly 2,272 messages per month.  The sample standard deviation was 953 messages per month.  Construct confidence intervals  for the following confidence levels:

a.   90%

b.   95%

c.   99%

Math   Statistics-And-Probability   
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