A leasing firm claims that the mean number of miles driven annually,
μ
, in its leased cars is less than
13160
miles. A random sample of
19
cars leased from this firm had a mean of
12833
annual miles driven. It is known that the population standard deviation of the number of miles driven in cars from this firm is
1980
miles. Assume that the population is normally distributed. Is there support for the firm's claim at the
0.1
level of significance?
Perform a onetailed test. Then fill in the table below.
Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table.

Given:
= 13160, n = 19, = 12833, = 1980, = 0.1
Hypothesis:
Ho: = 13160
Ha: < 13160
The Type of test statistic: Z test
Test statistic:
Critical value:
Z =Z0.1 = 1.282 ..................Using standard Normal table
Conclusion:
Z > Z , i.e. 0.720 > 1.282, That is Fail to Reject Ho at 1% level of significance.
ANSWER: B
No
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