Statistical Methods and Psychological Testing — DU B.A (Prog.) Psychology as Major Previous Year Question Papers

1. (a) Discuss the relevance of statistics in psychology. Explain the difference between descriptive and inferential statistics. (10) (b) Explain the meaning of left-skewed and right-skewed distributions. Illustrate each with a rough sketch and provide one suitable example for each. 8. (a) Does correlation imply causation? Explain with a suitable example. (5) (b) Using a 10-point scale, two managers independently rate the performance of five salespeople. Construct a scatter diagram and determine the direction of the relationship. (5) Dexterity Anxiety 5. Define reliability. Discuss the different methods for assessing the reliability of a test. (20) 6. Define measurement. Discuss the different types of measurement scales along with suitable examples. 7. (a) The mean of a set of scores is 20 and its standard deviation is 3. What will the mean and standard deviation become (i) if 10 points are added to each score (ii) Each score is multiplied by 2? (b) Construct a histogram for the following scores obtained by 50 students on a midterm examination of positive psychology: (10) 2. (a) Describe the properties of median and mean. If a dataset has mean = median = mode, what can you say about the shape of the distribution? (10) (b) Calculate the mean, median, variance, and standard deviation for the following scores: (2+2+3+3) 3. (a) Define z-scores. Discuss the properties of Z-scores and compare them with percentile ranks. (b) Six months after a divorce, the former wife and husband each take a test that measures divorce adjustment. The wife's score is 62, and the husband's score is 58. Overall, the mean score for divorced women on this test is 60 and SD = 3, and the mean score for divorced men is 55 and SD = 2. Which of the two has adjusted better to the divorce in relation to other divorced people of the same gender? (10) 4. (a) Discuss the properties of the Normal Probability (b) Four research participants take a test of manual dexterity (higher scores indicate better dexterity), and an anxiety test (higher scores indicate greater anxiety). The scores-are given below. Compute Pearson's correlation coefficient. (10)