Reference no: EM132167288

The sample standard deviation of the differences between the pretreatment and posttreatment KPS scores is 10.787. Using a 0.05 significance level, you need to test the claim that interventional bronchoscopic therapy improves functional impairment, i.e., that the KPS score is higher after the therapy.

Pretreatment (%) --> 90; 80; 90; 90; 90; 90; 80; 90; 50; 60; 50

Posttreatment (%) --> 100; 100; 100; 100; 100; 100; 100; 100; 80; 100; 80

What is the most appropriate test for the given claim? Two-sample z-test; Two-sample (pooled variance) t-test; Two-sample (unpooled variance) t-test; Paired t-test; or Wilcoxon rank-sum test?

What is the null hypothesis H0?

a. x¯1 - x¯2 ≤ 0

b. x¯1 - x¯2 > 0

c. μd ≤ 0

d. μd > 0

e. μ1 - μ 2 ≤ 0

f. μ1 - μ 2 > 0