z-scores

• explanation of, 80

• inference using, 80–81, 88–89

• interpretation of, 81

• method to find, 80–81

• population, 80

• sample, 80

• use of, 89, 200

z-statistic, 352

• confidence intervals and, 255–260

• hypothesis test and, 323–326

• large-sample population mean comparisons and, 369–374