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.

PreferredNon-preferred

127

79

118

1310

109

a.Which kind of t-test should be used? ANSWER : CorrelatedT-Test?

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.