Page 381 - Statistics for Dummies
P. 381
365
personal expenses, pie charts for, 92
confidence intervals for, 201–204
picture form, expressing your exam
question in, 342–343
described, 51, 72
pie charts
hypothesis tests, 228–229
described, 16, 92
population proportion, 175, 206–207
evaluating, 97
population standard deviation
confidence intervals for population mean
of lotto revenue, 92–94
when you don’t know, 203–204
misleading graphs, 320
confidence intervals for population mean
for ordering takeout, 94–95
for personal expenses, 92
when you know, 202–203
confidence intervals for the difference of
for projecting age trends, 95–96
two population means when you don’t
tips for, 97
know, 210–211
placebo, 57
placebo effect, 57, 265–266
confidence intervals for the difference of
two population means when you know,
planning and designing surveys, 250–254
208–210
polls
analyzing data in, 259
standard error, 167–169
bias in, minimizing, 13 population mean Index 365
population variability, 201
carrying out, 256–259 predictions
collecting data for, 256–257 interpretation, 315
conclusions, drawing, 259–260 overview, 292–293
cover letter for, 253 probabilities
errors in interpretation of survey results, sample mean, 173–174
259–260 sample proportion, 177–178
ethical issues, 253 t-table, 160
following up, 257–259 probability distributions, 133–134
impact of, 248–250 Probability For Dummies (Rumsey), 100
interpreting results of, 259–260 problems, understanding what the
media and statistics, 27 question is asking in test, 339–340
organizing data in, 259 process for surveys, 250
overview, 11–12, 58, 245–246 projecting age trends, pie charts for, 95–96
planning and designing, 250–254 projecting from sample to population,
process for, 250 314–315
purpose of your survey, clarifying, 251 properties
questions on, formulating, 253–254 correlation, 286
response rate, 258 normal distribution, 144–145
sample selection, 254–256 purpose of your survey, clarifying, 251
sources for, 246–247 p-values
target population, 250–252 calculating, 222–223
timing for, 252 defi ning, 221
topics for, 248 guidelines for, 224
type of, 252 overview, 61, 220
pollsters, 246 test statistics and, 220–221
population, 47–48
3/25/11 8:12 PM
32_9780470911082-bindex.indd 365 3/25/11 8:12 PM
32_9780470911082-bindex.indd 365
