A car-rental company is interested in the amount of time its vehicles are out of
ID: 3260954 • Letter: A
Question
A car-rental company is interested in the amount of time its vehicles are out of operation for repair work. State all assumptions and find a 95 % confidence interval for the mean number of days in a year that all vehicles in the company's fleet are out of operation if a random sample of 10 cars showed the following number of days that each had been inoperative.
10
25
18
21
17
12
5
15
13
8
A.
The variance is less than the mean
B.
The sample comes from a normal population
C.
It is a random sample
D.
The sample size is at least 30
Find a
95
%
confidence interval for the population mean.
The
95
%
confidence interval is from a lower limit of
to an upper limit of
(Round to two decimal places as needed.)
Explanation / Answer
The statistical software output for this problem is:
One sample T confidence interval:
: Mean of variable
95% confidence interval results:
Assumptions: Option A and Optionn C are correct.
95% confidence interval: (10.05, 18.75)
Variable Sample Mean Std. Err. DF L. Limit U. Limit var13 14.4 1.9218047 9 10.052576 18.747424Related Questions
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