A car dealer wants to get information about the number of years car owners keep their cars. A random sample of 25 car owners resulted in ?̅ = 7.01 years, and ? = 3.74 years. Assume that the sample is...








A car dealer wants to get information about the number of years car owners keep their cars. A random sample of 25 car owners resulted in ?̅ = 7.01 years, and ? = 3.74
years. Assume that

the sample is drawn from a normally distributed population.





3. Construct a95% confidence interval for the mean number of years of car

ownership.


(a) (5.25,8.19)
(b) (5.55,
8.46)

 (c) (5.41,
8.29)
 (d) (5.47,
8.55)

(e) (5, 8)







  1. All other information remaining unchanged, which of the following would produce a wider interval than the 95% confidence interval constructed?







(a) The sample size is 29 instead of 25.
(b) The sample size is 10 instead of 25.


(c) Compute a 80% confidence interval rather than a 95% confidence interval.


(d) Compute a 90% confidence interval rather than a 95% confidence interval.


(e) The sample standard deviation is computed to be 1.52 instead of 3.74.









Jun 01, 2022
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