Statistics For Dummies®, 2nd Edition

Index

Symbols and Numerics

> (greater than), 141

≥ (greater than or equal to), 141

90th percentile (top 10%), 155

68-95-99.7% rule, 53, 81–83, 112

10th percentile (bottom 10%), 155

A

ACT scores, comparing, 87–89

alpha level, 223

alternative hypothesis, 61, 217

analyses

confidence interval, 18

correlation, 20

data from experiments, 274–277

data in surveys, 259

hypothesis tests, 18–19

margin of error, 18

overview, 17–18

regression, 20

two-way tables, 20

anecdotes

avoiding influence of, 330

as factor in misleading statistics, 40

anonymous respondents, 257

arithmetic errors, 34

average (mean)

binomials, 142

boxplots, 120

calculating, 71–73

histograms, 109

median compared with, 74–76

normal distribution, 143

overview, 51–52

population, 51

random variables, 134

sample, 51

sampling distribution, 164–166

B

bad sample, 49

bar graphs

described, 16

evaluating, 102

frequency, 97

horizontal, 102 ...