Question list Question 1 Question 2 Question 3 Question 4 K Captopril is a drug designed to lower systolic blood pressure. The systolic blood pressure reading (mmHg) of subjects were measured before and after they took the drug. Results are given in the accompanying table (based on data from "Essential Hypertension: Effect of an Oral Inhibitor of Angiotensin-Converting Enzyme," by MacGregor et al., British Medical Journal, Vol. 2). Assume that the paired sample data is a simple random sample and that the differences have a distribution that is approximately normal. Complete parts (a) and (b). Before After OA. Ho: Hd = 0 H₁: Hd >0 179 169 182 155 185 209 170 210 193 174 200 198 159 146 151 145 159 183 167 177 176 170 191 177 a. Use a 0.05 significance level to test the claim that captopril is effective in lowering systolic blood pressure. Defined as the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the systolic blood pressure reading before captopril was taken minus the reading after captopril was taken. What are the null and alternative hypotheses for the hypothesis test? OC. Ho Hd #0 H₁: Hd=0 OB. Ho: Hd=0 H₁: Hd <0 Q OD. Ho: Hd #0 H₁: Hd > 0

Denny studied factors affecting cardiovascular reactivity to a postural change in a sample of healthy men and women. Change in systolic blood pressure (SBP) from supine to standing position was used as the measure of cardiac reactivity in a sample of 842 adults. Supine measurement of blood pressure was taken after participants had lain on an examination table for 15 minutes. Blood pressure was determined every 30 seconds using a Dinamap device for 2 minutes, and the measurements were averaged. Participants then stood up immediately, and additional measurements were made for another 2 minutes. Below is a table describing the characteristics of Denny’s sample: Which measures of dispersion, if any, are presented in this table (Ranges, SDs)? If age is normally distributed, approximately what percent of the sample would be younger than 50? If BMI is normally distributed, approximately what percent of the sample would have a BMI higher than 33.1?

The authors of the paper "Statistical Methods for Assessing Agreement Between Two Methods of Clinical Measurement"† compared two different instruments for measuring a person's ability to breathe out air. (This measurement is helpful in diagnosing various lung disorders.) The two instruments considered were a Wright peak flow meter and a mini-Wright peak flow meter. Seventeen people participated in the study, and for each person air flow was measured once using the Wright meter and once using the mini-Wright meter.   Subject Mini-WrightMeter WrightMeter Subject Mini-WrightMeter WrightMeter 1 512 494 10 445 433 2 430 395 11 432 417 3 520 516 12 626 656 4 428 434 13 260 267 5 500 476 14 477 478 6 600 557 15 259 178 7 364 413 16 350 423 8 380 442 17 451 427 9 658 650         (a) Suppose that the Wright meter is considered to provide a better measure of air flow, but the mini-Wright meter is easier to transport and to use. If the two types of meters produce…