# Question

A random sample of the scores of 100 applicants for clerk-typist positions at a large insurance company showed a mean score of 72.6. The preparer of the test maintained that qualified applicants should average 75.0.

a. Determine the 99% confidence interval for the mean score of all applicants at the insurance company. Assume that the standard deviation of test scores is 10.5.

b. Can the insurance company conclude that it is getting qualified applicants (as measured by this test)?

a. Determine the 99% confidence interval for the mean score of all applicants at the insurance company. Assume that the standard deviation of test scores is 10.5.

b. Can the insurance company conclude that it is getting qualified applicants (as measured by this test)?

## Answer to relevant Questions

The length of time it takes to play a Major League Baseball game is of interest to many fans. To estimate the mean “time of game,” a random sample of 48 National League games was identified and the “time of game” (in ...A fish hatchery manager wants to estimate the mean length of her 3-year-old hatchery-raised trout. She wants to make a 99% confidence interval accurate to within 1\3 of a standard deviation. How large a sample does she need ...The expected mean of a continuous population is 200, and its standard deviation is 15. A sample of 80 measurements gives a sample mean of 205. Using a 0.01 level of significance, a test is to be made to decide between “the ...At a very large firm, the clerk-typists were sampled to see whether salaries differed among departments for workers in similar categories. In a sample of 50 of the firm’s accounting clerks, the average annual salary was ...Referring to Exercise 8.1: a. How is the distribution of the sample height data on p. 344 related to: (1) The distribution of the population? (2) The sampling distribution of sample means? b. Using the techniques of Chapter ...Post your question

0