The average monthly cell phone bill of a David Bourgeois Saylor Business

Question 41 / 187: The average monthly cell phone bill of a random sample of 256 residents of a city is $90 with a sample standard deviation of $24. What will be the 90% confidence interval for the mean monthly phone bills of all residents?

A $87.53 to $92.48

B $87.06 to $92.94

C $50.40 to $129.60

D $42.96 to $137.04

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https://www.jobilize.com/business-statistics-by-david-bourgeois-bharatendra-rai

Business Statistics

Author:

David BourgeoisLecturer

The Saylor Academy

USA

Access: Public Instant Grading

Attribution: David T. Bourgeois, PhD; Bharatendra K. Rai, PhD. Business Statistics. The Saylor Academy 2014, http://www.saylor.org/courses/bus204/

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