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PSY 550 Midterm Answers

Compare and contrast the following terms: (a) test-retest reliability with inter-rater

reliability, (b) content validity with both predictive validity and construct validity, and (c)

internal validity with external validity.

Test-retest reliability and Inter-rater reliability:

Test-retest reliability measures the reliability of a test overtime and measures its consistency. For

example, if we gave the same test twice to the same people, but at a different time, we co...
PSY 550 Midterm - Questions & Answers, Latest 2022 Complete 100% Correct Answers, Grand Canyon University.
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PSY 550 Midterm Answers

Compare and contrast the following terms: (a) test-retest reliability with inter-rater

reliability, (b) content validity with both predictive validity and construct validity, and (c)

internal validity with external validity.

Test-retest reliability and Inter-rater reliability:

Test-retest reliability measures the reliability of a test overtime and measures its consistency. For

example, if we gave the same test twice to the same people, but at a different time, we co...
Chapter 16, numbers 16.9, 16.10, 16.12 and 16.14

16.9

Given the aggression scores below for Outcome A of the sleep deprivation experiment, verify

that, as suggested earlier, these mean differences shouldn’t be taken seriously by testing the null

hypothesis at the .05 level of significance. Use the computation formulas for the various sums of

squares and summarize results with an ANOVA table.

ANOVA: Single

Factor

SUMMARY

Groups

Coun

t

Su

m

Averag

e

Varianc

e

zero 3 15 5 4

twe...
Grand Canyon University_PSY 520 Topic 6 Exercise:Chapter 16, 17, 18 COMPLETE SOLUTION
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Chapter 16, numbers 16.9, 16.10, 16.12 and 16.14

16.9

Given the aggression scores below for Outcome A of the sleep deprivation experiment, verify

that, as suggested earlier, these mean differences shouldn’t be taken seriously by testing the null

hypothesis at the .05 level of significance. Use the computation formulas for the various sums of

squares and summarize results with an ANOVA table.

ANOVA: Single

Factor

SUMMARY

Groups

Coun

t

Su

m

Averag

e

Varianc

e

zero 3 15 5 4

twe...
PSY-520 Topic 2 Exercises – Chapters 5 & 8

Jones-2018

5.11 Scores on the Wechsler Adult Intelligence Scale (WAIS) approximate a normal curve with a

mean of 100 and a standard deviation on 15. What proportion of the IQ scores are

a. above Kristen’s 125? z= 125-100/15= 1.67 using the z table on page 536 = 0.0475

b. below 82? z=82-100/15 = -1.2

C’=0.1151

c. Within 9 points of the mean? 100 +9=109

109-100/15=0.6

100-9=91

91-100/15=-0.6

B+B’

.2257+.2257

=0.4514

d. More than 40 p...
Grand Canyon University:PSY 520 Topic 2 Exercise,Chapter 5 and 8;Verified Answers(Graded A)
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PSY-520 Topic 2 Exercises – Chapters 5 & 8

Jones-2018

5.11 Scores on the Wechsler Adult Intelligence Scale (WAIS) approximate a normal curve with a

mean of 100 and a standard deviation on 15. What proportion of the IQ scores are

a. above Kristen’s 125? z= 125-100/15= 1.67 using the z table on page 536 = 0.0475

b. below 82? z=82-100/15 = -1.2

C’=0.1151

c. Within 9 points of the mean? 100 +9=109

109-100/15=0.6

100-9=91

91-100/15=-0.6

B+B’

.2257+.2257

=0.4514

d. More than 40 p...
1.8 Indicate whether each of the following studies is an experiment or an observational study. If

it is an experiment, identify the independent variable and note any possible confounding

variables.

(a) A psychologist uses chimpanzees to test the notion that more crowded living conditions

trigger aggressive behavior. Chimps are placed, according to an impartial assignment rule, in

cages with either one, several, or many other chimps. Subsequently, during a standard

observation period, each ...
Grand Canyon University:PSY 520 Topic 1 Exercise 1, Chapter 1 to 4;Verified Answers(Graded A)
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1.8 Indicate whether each of the following studies is an experiment or an observational study. If

it is an experiment, identify the independent variable and note any possible confounding

variables.

(a) A psychologist uses chimpanzees to test the notion that more crowded living conditions

trigger aggressive behavior. Chimps are placed, according to an impartial assignment rule, in

cages with either one, several, or many other chimps. Subsequently, during a standard

observation period, each ...
13.6 It’s well established, we’ll assume, that lab rats require an average of 32 trials in a complex water maze before reaching a learning criterion of three consecutive errorless trials. To determine whether a mildly adverse stimulus has any effect on performance, a sample of seven lab rats were given a mild electrical shock just before each trial. 13.8 Assume that on average, healthy young adults dream 90 minutes each night, as inferred from a number of measures, including rapid eye moveme...
Grand Canyon University_PSY 520 Topic 5 Exercise:Chapter 13, 14 and 15 COMPLETE SOLUTION(A Plus Work)
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13.6 It’s well established, we’ll assume, that lab rats require an average of 32 trials in a complex water maze before reaching a learning criterion of three consecutive errorless trials. To determine whether a mildly adverse stimulus has any effect on performance, a sample of seven lab rats were given a mild electrical shock just before each trial. 13.8 Assume that on average, healthy young adults dream 90 minutes each night, as inferred from a number of measures, including rapid eye moveme...
For each of the following examples, explain whether the researcher has made

a correct decision or has made a Type 1 or Type 2 error. Explain why.

1. Dr. G rejects the null hypothesis although the independent variable had no

effect.

2. Dr. R rejects the null hypothesis when it is false.

3. Although the independent variable had an effect, Dr. E does not reject the

null hypothesis

1. Dr. G rejects the null hypothesis although the independent variable had no effect. This

problem would be a t...
PSY 550 FINAL EXAM ANSWERS
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For each of the following examples, explain whether the researcher has made

a correct decision or has made a Type 1 or Type 2 error. Explain why.

1. Dr. G rejects the null hypothesis although the independent variable had no

effect.

2. Dr. R rejects the null hypothesis when it is false.

3. Although the independent variable had an effect, Dr. E does not reject the

null hypothesis

1. Dr. G rejects the null hypothesis although the independent variable had no effect. This

problem would be a t...
PSY 550 Final Exam Answers; Grand Canyon University/PSY 550 Final Exam Answers; Grand Canyon University For each of the following examples, explain whether the researcher has made a correct decision or has made a Type 1 or Type 2 error. Explain why. (a) G rejects the null hypothesis although the independent variable had no effect. (b) R rejects the null hypothesis when it is false. (c) Although the independent variable had an effect, Dr. E does not reject the null hypothesis. Explain the value o...
PSY 550 Final Exam Answers; Grand Canyon University
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PSY 550 Final Exam Answers; Grand Canyon University/PSY 550 Final Exam Answers; Grand Canyon University For each of the following examples, explain whether the researcher has made a correct decision or has made a Type 1 or Type 2 error. Explain why. (a) G rejects the null hypothesis although the independent variable had no effect. (b) R rejects the null hypothesis when it is false. (c) Although the independent variable had an effect, Dr. E does not reject the null hypothesis. Explain the value o...
PSY 550 Final Exam 1 Research Methods-Questions and Answers-Grand Canyon University
Exam (elaborations) • 5
pages
• 2021
1. Chuck Wagon is very excited about the within-subjects approach. “Now I’ll never need

to run large numbers of subjects again,” he says. However, Chuck has forgotten that

within-subjects designs may be a) useless, b) impossible, c) confounded by order effects, or

d) impractical when excessive subject time spent in an experiment makes data inaccurate.

Give an example of each of these four objections.

Answer:

a). useless- a within-subjects design would be useless if we were studying t...
PSY 550 Final Exam 1 Research Methods-Questions and Answers-Grand Canyon University
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1. Chuck Wagon is very excited about the within-subjects approach. “Now I’ll never need

to run large numbers of subjects again,” he says. However, Chuck has forgotten that

within-subjects designs may be a) useless, b) impossible, c) confounded by order effects, or

d) impractical when excessive subject time spent in an experiment makes data inaccurate.

Give an example of each of these four objections.

Answer:

a). useless- a within-subjects design would be useless if we were studying t...