MATLAB: An Introduction with Applications
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ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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DATAfile: Administrator
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Suppose the national mean annual salary for a school administrator is $91,500 a year. A school official took a sample of 25 school administrators in the state of Ohio to learn about salaries in that state to see if they differed from the national average.
77,600 | 76,000 | 90,700 | 97,200 | 90,700 |
101,800 | 78,700 | 81,300 | 84,200 | 97,600 |
77,500 | 75,700 | 89,400 | 84,300 | 78,700 |
84,600 | 87,700 | 103,400 | 83,800 | 101,300 |
94,700 | 69,200 | 95,400 | 61,500 | 68,800 |
(a)
Formulate hypotheses that can be used to determine whether the population mean annual administrator salary in Ohio differs from the national mean of $91,500.
H0: μ < 91,500
Ha: μ ≥ 91,500
H0: μ = 91,500
Ha: μ ≠ 91,500
H0: μ ≤ 91,500
Ha: μ > 91,500
H0: μ ≥ 91,500
Ha: μ < 91,500
H0: μ > 91,500
Ha: μ ≤ 91,500
(b)
The sample data for 25 Ohio administrators is contained in the file named Administrator.
What is the test statistic for your hypothesis test in part (a)? (Round your answer to three decimal places.)
What is the p-value for your hypothesis test in part (a)? (Round your answer to four decimal places.)
p-value =
(c)
At
α = 0.05,
can your null hypothesis be rejected? What is your conclusion?Do not reject H0. We can conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary.Reject H0. We can conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary. Do not reject H0. We cannot conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary.Reject H0. We cannot conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary.
(d)
Repeat the preceding hypothesis test using the critical value approach.
State the null and alternative hypotheses.
H0: μ < 91,500
Ha: μ ≥ 91,500
H0: μ = 91,500
Ha: μ ≠ 91,500
H0: μ ≤ 91,500
Ha: μ > 91,500
H0: μ ≥ 91,500
Ha: μ < 91,500
H0: μ > 91,500
Ha: μ ≤ 91,500
Find the value of the test statistic. (Round your answer to three decimal places.)
State the critical values for the rejection rule. Use
α = 0.05.
(Round your answer to three decimal places. If the test is one-tailed, enter NONE for the unused tail.)test statistic≤test statistic≥
State your conclusion.
Do not reject H0. We can conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary.Reject H0. We can conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary. Do not reject H0. We cannot conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary.Reject H0. We cannot conclude that the mean annual administrator salary in Ohio differs significantly from the national mean annual salary.
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