A Telecom service provider claims that individual customers pay on average $400 per month. A random sample of 50 customers' bills during a given month is taken with a mean of $250 and standard deviation of $15. (a) What to say with respect to the claim made by the service provider? (b) Report a 95% two-sided confidence interval for the mean paid per month.

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A Telecom service provider claims that individual customers pay on average $400 per month.
A random sample of 50 customers' bills during a given month is taken with a mean of $250 and standard
deviation of $15.
(a) What to say with respect to the claim made by the service provider?
(b) Report a 95% two-sided confidence interval for the mean paid per month.
Transcribed Image Text:A Telecom service provider claims that individual customers pay on average $400 per month. A random sample of 50 customers' bills during a given month is taken with a mean of $250 and standard deviation of $15. (a) What to say with respect to the claim made by the service provider? (b) Report a 95% two-sided confidence interval for the mean paid per month.
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