Question

Number of Jobs A sociologist found that in a random sample of 50 retired men, the average number of jobs they had during their lifetimes was $7.2 .$ The population standard deviation is $2.1 .$ a. Find the best point estimate of the population mean. b. Find the $95 \%$ confidence interval of the mean number of jobs. c. Find the $99 \%$ confidence interval of the mean number of jobs. d. Which is smaller? Explain why.

          Number of Jobs A sociologist found that in a random
sample of 50 retired men, the average number of jobs
they had during their lifetimes was $7.2 .$ The population
standard deviation is $2.1 .$
a. Find the best point estimate of the population
mean.
b. Find the $95 \%$ confidence interval of the mean number of jobs.
c. Find the $99 \%$ confidence interval of the mean number of jobs.
d. Which is smaller? Explain why.

Added by Rachel M.

Instant Answer

Solved by Expert Ajiboye Tunde

11/10/2021

Step 1

Given that the sample mean is $\bar{x} = 7.2$, the best point estimate of the population mean is the same as the sample mean, which is $\mu = 7.2$. Show more…

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Number of Jobs A sociologist found that in a random sample of 50 retired men, the average number of jobs they had during their lifetimes was $7.2 .$ The population standard deviation is $2.1 .$ a. Find the best point estimate of the population mean. b. Find the $95 \%$ confidence interval of the mean number of jobs. c. Find the $99 \%$ confidence interval of the mean number of jobs. d. Which is smaller? Explain why.