Warren County Telephone Company claims in its annual report that "the typical customer spends $61 per month on local and long-distance service." sample of 12 subscribers revealed the following amounts spent last month. $65 $66 $65 $68 $59 $63 $68 $65 $64 $58 $54 $65 a. What is the point estimate of the population mean? (Round your answer to 3 decimal places.) Estimated population mean SA

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.2: Representing Data
Problem 22PFA
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Warren County Telephone Company claims in its annual report that "the typical customer
spends $61 per month on local and long-distance service." A sample of 12 subscribers
revealed the following amounts spent last month.
$65 $66 $65 $68 $59 $63 $68 $65 $64 $58 $54 $65
a. What is the point estimate of the population mean? (Round your answer to 3 decimal
places.)
Estimated population
mean
b. Develop a 99% confidence interval for the population mean. (Use t Distribution Table.)
Round your answers to 3 decimal places.)
Confidence interval for the population
mean
$
Yes
No
and $
c. Is the company's claim that the "typical customer" spends $61 per month reasonable?
Transcribed Image Text:Warren County Telephone Company claims in its annual report that "the typical customer spends $61 per month on local and long-distance service." A sample of 12 subscribers revealed the following amounts spent last month. $65 $66 $65 $68 $59 $63 $68 $65 $64 $58 $54 $65 a. What is the point estimate of the population mean? (Round your answer to 3 decimal places.) Estimated population mean b. Develop a 99% confidence interval for the population mean. (Use t Distribution Table.) Round your answers to 3 decimal places.) Confidence interval for the population mean $ Yes No and $ c. Is the company's claim that the "typical customer" spends $61 per month reasonable?
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