Warren County Telephone Company claims in its annual report that “the typical cu
ID: 3248168 • Letter: W
Question
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.
$64
$67
$65
$66
$59
$64
$68
$62
$64
$59
$54
$66
What is the point estimate of the population mean? (Round your answer to 3 decimal places.)
$
Develop a 95% confidence interval for the population mean. (Use t Distribution Table.) (Round your answers to 3 decimal places.)
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.
Explanation / Answer
The statistical software output for this problem is:
One sample T confidence interval:
: Mean of variable
95% confidence interval results:
Hence,
a) Point estimate = 63.167
b) 95% confidence interval: (60.599, 65.734)
c) Since this interval contains $61, the answer is Yes
Variable Sample Mean Std. Err. DF L. Limit U. Limit var7 63.166667 1.1666667 11 60.598851 65.734483Related Questions
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