PSY 550 (PSY550)

Question 1: test-retest reliability with inter-rater reliability content validity with both predictive validity and construct validity internal validity with external validity Question 2: Define and describe the six steps of the scientific method. Give an example of each step Question 3: When is it appropriate for a researcher to use deception in a study? When is it not appropriate? How can the negative effects of deception be minimized? Question 4: Use Stevens’ model of m...

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...

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 ...

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...

PSY 550 Final Exam Answers

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...