20250519 9.3: Independent Samples for Two Means
Source: 9.3: Independent Samples for Two Means Kathryn Kozak Coconino Community College Example 9.3.1 hypothesis test for two means The cholesterol level of patients who had heart attacks was measured two days after the heart attack. The researchers want to see if patients who have heart attacks have higher cholesterol levels over healthy people, so they also measured the cholesterol level of healthy adults who show no signs of heart disease. The data is in Table 9.3.1 ("Cholesterol levels after," 2013). Do the data show that people who have had heart attacks have higher cholesterol levels over patients that have not had heart attacks? Test at the 1% level. Cholesterol Level of Heart Attack Patients Cholesterol Level of Healthy Individual 270 196 236 232 210 200 142 242 280 206 272 178 160 184 220 198 226 160 242 182 186 182 266 198 206 182 318 238 294 198 282 188 234 166 224 204 276 182 282 178 360 212 310 164 280 230 278 186 288 162 ...