The following exercises are designed to give you hands-on practice of the skills learned in this chapter.
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
Draw each of the following: a positively skewed curve, a negatively skewed curve, and a symmetrical curve.
Draw approximate scatter plots for each of the following correlations: .22, .50, -.73, -.02, .02, 1.00, -.50.
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?
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