Ninth Edition CoverGraziano & Raulin
Research Methods (9th edition)

Chapter 5 Exercises
Statistical Analysis of Data

The following exercises are designed to give you hands-on practice of the skills learned in this chapter.

  1. For each of the following data sets: (1) draw a graph describing the data, (2) compute measures of central tendency, and (3) compute the measures of variability.
    (a) 119, 97, 90, 102, 117, 101, 94, 98, 102, 111
    (b) 20, 27, 24, 20, 33, 18, 39, 45, 30, 31, 28, 42, 25
    (c) 55, 75, 50, 95, 80, 65, 60, 70, 85, 95, 90

  2. Draw each of the following: a positively skewed curve, a negatively skewed curve, and a symmetrical curve.

  3. Draw approximate scatter plots for each of the following correlations: .22, .50, -.73, -.02, .02, 1.00, -.50.

  4. What kind of statistical test would you use to answer each of the following research questions?
    (a) Is the weight of sixth grade boys related to their aggressiveness?
    (b) Are girls better than boys at fine motor coordination?
    (c) Will laboratory animals' behavior change as each participant is tested under conditions of increasing noise?
    (d) Do fourth-, fifth-, and sixth-grade children differ in their concerns for animal welfare?

  5. For each of the following data sets, (i) draw a descriptive graph, (ii) compute the measures of central tendency, and (iii) compute the measures of variability.
    (a) 20 scores: 8; 6; 4; 3; 9; 5; 7; 8; 6; 7; 9; 5; 9; 8; 9; 7; 4; 8; 7; 9
    (b) 15 IQ scores: 104; 121; 94; 107; 81; 96; 100; 96; 102; 115; 87; 101; 91; 114; 111