Independence, 148–151

Independent classifications, 471

Independent events

• explanation of, 148, 150

• probability of intersection of, 150

• simultaneously occurring, 150–151

Independent sampling

• comparing two population means and, 369–379

• comparing two population proportions and, 451–455

Independent variable, 502

Inferences. See also Statistical inference; specific topics

• based on survey samples employing self-selection, 15

• explanation of, 3

• reliability of, 8

Inferential statistics

• elements of problems in, 5–6, 8

• explanation of, 3

Inner fences, 84–85

Interquartile range (IQR), 84

Intersections

• calculating probability of, 145–149

• of events, 130–133

• of independent events, 150

Interval estimator. See also Confidence intervals

• calculation of, 255

• explanation of, 254

• large-sample, 255–256