Textbook Problem

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Older people often have a hard time finding work. AARP reported on the number of weeks it takes a worker aged 55 plus to find a job. The data on number of weeks spent searching for a job contained in the file JobSearch are consistent with the AARP findings.

1. a. Provide a point estimate of the population mean number of weeks it takes a worker aged 55 plus to find a job.
2. b. At 95% confidence, what is the margin of error?
3. c. What is the 95% confidence interval estimate of the mean?
4. d. Discuss the degree of skewness found in the sample data. What suggestion would you make for a repeat of this study?

To determine

Find the point estimate of the population mean number of weeks it takes a worker aged 55 plus to find a job.

Explanation of Solution

Calculation:

The given data shows that the number of weeks spent searching for a job.

The sample mean $\overline{x}$ is an estimate of the population mean.

Software Procedure:

Step-by-step procedure to obtain the mean value using the MINITAB software:

• Choose Stat > Basic Statistics > Display Descriptive Statistics.
• In Variables enter the columns Job Search Time (Weeks)

To determine

Find the margin of error.

To determine

Find the 95% confidence interval for population mean.

To determine

Discuss the degree of skewness found in the sample data.