Sample Question 1
1. Twenty men are selected and are given five minutes to attempt to memorize a list of unrelated
words. They are then asked to recall as many as they can. Determine whether the participants in
the present study are comparable to those in the earlier study in terms of recall in the normal
state. The mean of words recalled in the earlier study was 34.6
Answer:
Null Hypothesis: Ho: = 34.6
The aim of the test to determine whether the population mean is equal to a certain value (34.6).
Because the data (number of words recalled) are ratio measurements, and assuming the underlying
population is approximately normal and the subjects are randomly selected from the population, choose
a one sample t-test.
Sample Question 2
2. The mean cholesterol level of subjects is evaluated. The subjects are now asked to go on a
specific diet for one month. Determine the effect of the diet on cholesterol level of subjects.
Answer:
Null Hypothesis: There is no significant difference in subjects’ cholesterol level before and after
specific diet.
The aim of the test is to determine whether the specific diet has an effect in the cholesterol level of the
subjects. Cholesterol level is a continuous variable measured twice on the same subjects. Assuming that
data are normal, hence paired T-test is applicable.
Sample Question 3
3. The mean birth weights of girl and boy babies are recorded. Compare the birth weight of boy
and girl babies.
Answer:
Null Hypothesis: There is no significant difference between the birth weight of boy and girl
babies.
The aim of the test is to determine the birth weight of two independent groups. The birth weight is
continuous measured on two independent groups. The variable birth weight is assumed to be normal,
then independent T-test is applicable.
