Page 379 - Statistics for Dummies
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line graphs. See time charts
business section, 28
linear regression
conditions for, 287–288
examples of, 24–30
horoscopes, 30
explanatory variable, 287
Internet virus, 24
overview, 286–287
regression line, 286, 288–292
land development, 26
response variable, 287
medical malpractice insurance, 25–26
microwave popcorn and cancer, 24
lotto revenue, pie charts of, 92–94
low percentiles, 152–153
motorcycle fatalities, 25
movies, 30
• M •
overview, 23–24
school profi ciency, 26–27
sexual activity, 29
margin of error (MOE). See also confi dence
sports section, 27–28
intervals
surveys and polls, 27
checking for, 324
travel section, 28–29
confidence levels, 184, 188–189
weather report, 29–30
fi nding, 183–189
media sources, 33
limitations, 190–191 media, statistics in Index 363
overview, 58–59, 181–183 median
results, reporting, 186–187 boxplots, 120
sample mean, 187–188 calculating, 73–74
sample proportion, 184–186 histograms, 109
sample size, 189–191 mean compared with, 74–76
sample variability, measuring, 183–184 overview, 52
standard errors, 183–184 medical malpractice insurance,
marginal column totals, 298 statistics about, 25–26
marginal distributions medical studies, 31
calculating, 300 microwave popcorn and cancer,
graphing, 300–302 statistics about, 24
overview, 299–300 misleading graphs
marginal row totals, 298 bar graphs, 320–321
marginal totals, 297–298 confidence intervals, 213
mean (average) examples, 322
binomials, 142 histograms, 112–115, 323
boxplots, 120 overview, 37–39, 319
calculating, 71–73 pie charts, 320
histograms, 109 time charts, 124–127, 321
median compared with, 74–76 misleading questions, 253
normal distribution, 143 misleading statistics
overview, 51–52 anecdotes as factor in, 40
population, 51 cause-and-effect relationships as factor
random variables, 134 in, 40
sample, 51 crime statistics, 35–36
sampling distribution, 164–166 impact of, 42
measurements, 103 overview, 35
sample size as factor in, 39–40
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