Participants threw darts at a target. In one condition, they used their preferre
ID: 3430260 • Letter: P
Question
Participants threw darts at a target. In one condition, they used their preferred
hand; in the other condition, they used their other hand. All subjects performed in
both conditions (the order of conditions was counterbalanced). Their scores are
shown below.
Preferred Non-preferred
12 7
7 9
11 8
13 10
10 9
a. Which kind of t-test should be used?
b. Calculate the two-tailed t and p values using this t test.
c. Calculate the one-tailed t and p values using this t test.
Explanation / Answer
a) Paired t-test because the values from the preferred and non-preferred trials are from the same participants.
Using Microsoft Excel: =ttest(array1, array2, tails, type) --- tails: 1 or 2, type: paired (1)
b) =ttest(preffered,nonpreferred,2,1)=0.166=p value
c) =ttest(preferred,nonpreferred,1,1)=0.083=p value