Question

A health psychologist predicted that premature babies would gain more weight when they were massaged compared to being rocked. To test this prediction and with the consent of the parents, 8 premature babies in Regency Hospital participated in the experiment. All the babies were weighed before the experiment began. The babies were rocked for 20 minutes twice a day for two days and then weighed. Then the same babies were given a body massage for 20 minutes twice a day for two days and at then weighed. The change in their weight (measured in ounces) was the dependent variable.   The data are shown below.   

Baby	Rocked	Massaged
1	27.6	29.7
2	25.4	28.5
3	30.5	39.8
4	33.8	38.8
5	24.5	25.0
6	16.4	22.6
7	19.8	24.7
8	23.8	26.9

What is the one tail critical value at p = .05?

Select one:

a. 2.145

b. 2.120

c. 1.895

d. 2.365

Answer 1

here degree of freedom =n-1=8-1 =7

for 7 degree of freedom and 0.05 level with 1 tailed test ; critical value =1.895

option C is correct