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 ? = 3.74years. Assume thatthe sample is drawn from a normally distributed population.
3. Construct a95% confidence interval for the mean number of years of carownership.
(a) (5.25,8.19)(b) (5.55,8.46) (c) (5.41,8.29) (d) (5.47,8.55)(e) (5, 8)
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.
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