1. How can researchers increase the statistical power in their study? (Choose four.)

a. Increase the population variability

b. Use a larger alpha level (e.g., .05 rather than .01)

c. DecreaseN

d. Use a smaller alpha level (e.g., .01 rather than .05)

e. Decrease the effect size

f. Decrease the population variability

g. Increase the effect size

h. IncreaseN

2. How can researchers decrease the Type I error rate in their study?

a. Use a smaller alpha level (e.g., .01 rather than .05)

b. Decrease N

c. Increase N

d. Use a larger alpha level (e.g., .05 rather than .01)

e. Increase the effect size

f. Decrease the effect size

g. Decrease the population variability

h. Increase the population variability

3.To quantify the discrepancy between sample statistics and population parameters, researchers compute __________.

a. the mean of the distribution of sample means

b. the standard error of the mean

c. the standard deviation of the population scores

d. the sum of the squared deviation

4.A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

What is the symbolic null hypothesis (H₀)?

5.A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

What is the verbal null hypothesis (H₀)?

a. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will not have endurance scores different than 56.85.

b. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will not have endurance scores higher than 56.85.

c. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will not have endurance scores higher than 53.50.

d. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will not have endurance scores different than 53.50.

6.A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

What is the symbolic research hypothesis (H₁)?

7. A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

What is the verbal research hypothesis (H₁)?

a. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will have endurance scores different than 56.85.

b. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will have endurance scores different than 53.50.

c. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will have endurance scores higher than 56.85.

d. The population of people who consume 4 oz. of a sport drink during breaks between a series of three endurance tasks will have endurance scores higher than 53.50.

8. A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

Whatz-score value defines the critical region for this study using an = .05, one-tailed?

a. .05

b. +1.96 or -1.96

c. -1.65

d. 1.65

9. A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

Compute the standard error of the mean (SEM_p).

a. 0.21

b. 0.04

c. 15.00

d. 0.80

10. A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

Compute theztest statistic.

a. 15.95

b. 83.75

c. 4.19

d. 0.22

11.A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

Identify your decision regarding the H₀

a. Reject H₀,z(N= 350) = 4.19,p< .05.

b. Fail to Reject H₀,z(N= 350) = 15.95, p < .05.

c. Fail to Reject H₀,z(N= 350) = 0.22, p < .05.

d. Reject H₀,z(N= 350) = 83.75, p < .05.

12.Identify the type of hypothesis testing error you may have made and why.

A. Type II Error-may have rejected a true H₀.

B. Type II Error-may have failed toreject a false H₀.

C. Type I Error -may have rejected a true H₀.

D. Type I Error-may have failed toreject a false H₀.

13.A researcher is testing the hypothesis thatconsuming a sport drink during exercise willimproveendurance.A sample of N = 350 male college students is obtained, and each student is given a series of three endurance tasks and asked to consume 4 ounces of the drink during each break between the tasks. The overall endurance score for this sample isM= 56.85 andSD= 16.58.For the general population, without any sports drink, the scores for this task average, = 53.50 with a population standard deviation of = 15.00.Test using aone-tailedtest and an =.05.

Calculate the effect size (Cohen's d).

A. 0.01

B. 0.22

C. 0.05

D. 0.86

14. Identify which of the following statements represents an accurate interpretation of the results of this study

A. Consuming 4 oz. of a sport drink during each break between a series of three endurance taskswas found to significantly increase overall endurance scores in male college students (M= 56.85,SD= 16.58) versus the general population who does not consume sports drinks (= 52.00, = 15.00),z(N = 350) = 4.19,p< .05,d= 0.22. The effect size indicates a 0.22 standard deviation increase in endurance scores attributable to consuming a sports drink during exercise.

B. Consuming 4 oz. of a sport drink during each break between a series of three endurance taskswas not found to significantly increase overall endurance scores in male college students (M= 56.85,SD= 16.58) versus the general population who does not consume sports drinks (= 52.00, = 15.00),z(N = 350) = 0.22,p> .05,d= 0.01.The effect size indicates a 0.01 standard deviation increase in endurance scores attributable to consuming a sports drink during exercise.

C. Consuming 4 oz. of a sport drink during each break between a series of three endurance taskswas found to significantly increase overall endurance scores in male college students (M= 56.85,SD= 16.58) versus the general population who does not consume sports drinks (= 52.00, = 15.00),z(N = 350) = 85.75,p< .05,d= 0.86.The effect size indicates a 0.86 standard deviation increase in endurance scores attributable to consuming a sports drink during exercise.

D. Consuming 4 oz. of a sport drink during each break between a series of three endurance taskswas found to significantly increase overall endurance scores in male college students (M= 56.85,SD= 16.58) versus the general population who does not consume sports drinks (= 52.00, = 15.00),z(N = 350) = 15.95,p< .05,d= 0.05.The effect size indicates a 0.05 standard deviation increase in endurance scores attributable to consuming a sports drink during exercise.