Solutions Statistics

A clinical trial is conducted to determine the effectiveness of drug A in preventing premature labor

Question: A clinical trial is conducted to determine the effectiveness of drug A in preventing premature labor. Thirty women are randomly divided into a treatment group and a placebo group. Birth weights of infants born to the women are given below. Investigators wish to compare the birth weights of infants born to mothers within the treatment group with the infants born to mothers within the placebo group.

RQ: Is there a difference in the average birth weight in infants between those mothers who received drug A and those mothers who received the placebo?

Ho: mean birth weight treatment group = mean birth weight placebo group

Ha: mean birth weight treatment group does not equal mean birth weight placebo group

Step 1: Create the Variables

a. Start SPSS.

b. Click the Variable View tab.

c. Enter the variables therapy and weight in the rows.

d. Create value labels for therapy with 1 = drug A and 2 = placebo

The Data:

Participant	Therapy	Weight	Participant	Therapy	Weight
1	1	6.9	16	2	6.4
2	1	7.6	17	2	6.7
3	1	7.3	18	2	5.4
4	1	7.6	19	2	8.2
5	1	6.8	20	2	5.3
6	1	7.2	21	2	6.6
7	1	8.0	22	2	5.8
8	1	5.5	23	2	5.7
9	1	5.8	24	2	6.2
10	1	7.3	25	2	7.1
11	1	8.2	26	2	7.0
12	1	6.9	27	2	6.9
13	1	6.8	28	2	5.6
14	1	5.7	29	2	4.2
15	1	8.6	30	2	6.8