Warren County Telephone Company claims in its annual report that “the typical cu
ID: 2949834 • 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
$65
$63
$69
$57
$65
$68
$63
$64
$61
$54
$69
What is the point estimate of the population mean? (Round your answer to 3 decimal places.)
Develop a 98% confidence interval for the population mean. (Use t Distribution Table.) (Round your answers to 3 decimal places.)
$64
$65
$63
$69
$57
$65
$68
$63
$64
$61
$54
$69
Explanation / Answer
The statistical software output for this problem is:
One sample T confidence interval:
? : Mean of variable
98% confidence interval results:
Hence,
a) Point estimate = 63.5
b) 98% confidence interval: (59.951, 67.049)
c) Yes
Variable Sample Mean Std. Err. DF L. Limit U. Limit Data 63.5 1.3055824 11 59.951324 67.048676Related Questions
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