Question 4

Use the information in nhanes1.sav. The subjects’ systolic blood pressure was measured at the beginning of the examination (BPXSY1) and then again four hours later (BPXSY2). The researcher wants to know, if, on average, the systolic blood pressure after four hours differs from the systolic blood pressure at the beginning of the examination?

(a) Use a parametric test to answer this question by completing the following:

i. State appropriate hypotheses (define any symbols used).

ii. State (but do not check) the assumptions for carrying out this test. Describe the assumptions in the context of this question.

iii. Using an appropriate formula and showing all working, calculate the value of a suitable test statistic for this test.

iv. Without using SPSS, calculate the P-value of this test.

v. Interpret the P-value and describe the outcome of the test in the context of this question.

(b) If the assumptions for the test in part (a) were not satisfied, what alternative test could you perform?

Perform this non-parametric test by completing the following:

i. State appropriate hypotheses.

ii. Calculate the P-value of this test.

iii. Interpret the P-value and describe the outcome of the test in the context of this question.

(c) Compare the results from part (a) and (b), in particular the P-values and the conclusions. Do the results agree and why might they differ? Provide a graph in your answer to clarify your answer.

Assignment-Data-Set