mean¼ 4 : 47
standard deviation¼ 8 : 77Test to compare the means blood pressure under two di¤erent settings.
Name the test and state clearly your null and alternative hypotheses and
choice of test size.
7.5 In Example 7.10 a study with 21 transplants for 21 children was reported
where ultrasounds were taken at the time of liver transplant and again 5
to 10 years later to determine the systolic pressure of the hepatic artery.
In that example, Wilcoxon’s signed-rank test was applied to compare the
hepatic systolic pressures measured at two di¤erent times. Table E7.5
gives the diastolic presures obtained from the study. Test to compare the
mean diastolic hepatic pressures. Name the test and state clearly your
null and alternative hypotheses and choice of test size.TABLE E7.5
Diastolic Hepatic Pressure
Subject 5–10 Years Later At Transplant
114 25
210 10
320 23
410 14
5419
620 12
710 5
818 4
912 23
10 18 8
11 10 10
12 10 20
13 15 12
14 10 10
15 10 19
16 15 20
17 26 26
18 20 8
19 10 10
20 10 11
21 10 167.6 A study was conducted to investigate whether oat bran cereal helps to
lower serum cholesterol in men with high cholesterol levels. Fourteen
men were randomly placed on a diet which included either oat bran or272 COMPARISON OF POPULATION MEANS