PSCP S2 Practice Exam #3

The probability of a type I error is represented by which of the following symbols?

• φ

• β

• η

• α

A garbage collector believes that he averages picking up more than four tons of garbage per day. What is the null hypothesis for his statement?

• Ho: u < 4

• Ho: u > 4

• Ho: u = 4

• Ho: u ≠ 4

Which type of null hypothesis is used in the figure below?

• Ho: u = k

• Ho: u ≠ k

• Ho: u ≥ k

• Ho: u ≤ k

Which type of alternative hypothesis is used in the figure below?

• Ha: u = k

• Ha: u ≠ k

• Ha: u > k

• Ha: u < k

A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher than $7.58. A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. Give the p-value for the data provided above.

• 0.4987

• 0.0084

• 0.1325

• 0.0668

The Eagle Ridge Contractors Association claims the average price of a home in their subdivision is $125,150 with a standard deviation of $7,350. A sample of 36 homes for sale in this subdivision had an average selling price of $123,550. Is there evidence that the costs of homes for sale in this subdivision are actually lower than claimed? What is the p-value for a one-sided test of the data provided above?

• 0.0853

• 0.0951

• 0.1327

• 0.0036

A recent report from the American Medical Association claims that for the first time in 10 years, the average salary of psychiatrists was $189,121 with a standard deviation of $26,975. A random sample of 64 psychiatrists this year yielded an average salary of $198,630. Is there evidence that the average salary is actually higher than what the American Medical Association reported? At α = 0.05 , what is the p-value for a one-sided test?

• 0.0024

• 0.0035

• 0.1328

• 0.0237

The null hypothesis states that there is no difference between a parameter and a specific value, or that there is no difference between two parameters.

• True

• False

Sandra Johnson, a researcher, believes her pulse rate will decrease with exercise. Her alternative hypothesis would contain an equal sign.

• True

• False

Stating the hypothesis is the first step used in hypothesis testing.

• True

• False