For Exercises 6.23 to 6.25, see page 304; for 6.26 and 6.27, see pages 305–306; for 6.28 to 6.30, see page 309; for 6.31 and 6.32, see page 311; and for 6.33, see page 313.
6.31 Starting salaries.
You are planning a survey of starting salaries for recent business majors. In the latest survey by the National Association of Colleges and Employers, the average starting salary was reported to be $55,144.10 If you assume that the standard deviation is $11,000, what sample size do you need to have a margin of error equal to $1000 with 95% confidence?
6.31