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. A random sample of 100 observations from a population yields a mean equal to 10 and a standard deviation equal to 6. A 90% confidence interval for the mean of the population is(a) 10 ± 0.9870 (b) 10 ± 1.0248 (c) 10 ± 1.0266      (d) 10 ± 1.1760 (e) None of these

Question

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.

A random sample of 100 observations from a population yields a mean equal to 10 and a standard deviation equal to 6. A 90% confidence interval for the mean of the population is
(a) 10 ± 0.9870

(b) 10 ± 1.0248

(c) 10 ± 1.0266     

(d) 10 ± 1.1760

(e) None of these

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Hypothesis Testing

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