Question

The mean salary of federal government employees on the General Schedule is $59,593. The average salary of 30 state employees who do similar work is $58,800 with σσ= $1500. At the 0.01 level of significance, can it be concluded that state employees earn on average less than federal employees?

The mean age of Senators in the 109th Congress was 60.35 years. A random sample of 40 senators from various state senates had an average age of 55.4 years, and the population standard deviation is 6.5 years. At αα= 0.05, is there sufficient evidence that state senators are on average younger than the Senators in Washington?

Find the p-value, using the following information.

The test statistic in a left-tailed test is z = -1.25.

Answer 1

1.