Question

If the outcome of a repeated-measures t test is reported as t(23) = 2.76, what is the correct conclusion for an experiment that tested the effect of meditation on memory?

• A. The data showed a significant effect meditation on memory with p < .05 but no significant effect with p < .01, 2-tails test.

• B. The data showed a significant effect of meditation on memory with p < .05 and p < .01, 2-tails test.

• C. The data showed a significant effect of meditation on memory with p < .01 but no significant effect with p < .05, 2-tails test.

• D. The data showed no significant effect of meditation on memory with either p < .05 or p < .01, 2-tails test.

34. In a repeated-measures study examining the effect of therapy on eating disorders on a sample n = 21 participants, a researcher found a mean difference of M_D = 14 and an estimated standard, s_MD = 8. What is the value of the repeated-measures t-test for these data?

• A. 1.25

• B. 2.00

• C. 1.75

• D. 1.50

33. A repeated-measures study with n = 25 participants produces M_D= 22 and s = 45 of the difference scores, D. What is the estimated standard error for these data?

• A. 5

• B. 9

• C. 3

• D. None of these.

32.

For the following data from a repeated-measures study, what is the sample mean difference, M_D?

Participant     X₁             X₂

A                    1            5

B                     4           6

C                     5           2

• A. 23/2 = 11.5 (or - 11.5)

• B. 23/6 = 3.83 (or - 3.83)

• C. 9/3 = 3.0 (or - 3)

• D. 3/3 = 1.0 (or -1)

• E. None of the above.

31. Which combination of factors is most likely to produce a significant value of an independent-samples t-test?

• A. A large difference between sample means and a small estimated standard error.

• B. A small difference between sample means and a large estimated standard error.

• C. A small difference between sample means and a small estimated standard error.

• D. A large difference between sample means and a large estimated standard error.

Answer 1

1)

p value=0.0111 [ excel function:"=T.DIST.2T(2.76,23)"

A. The data showed a significant effect meditation on memory with p < .05 but no significant effect with p < .01, 2-tails test.

2) t = 14/8 = 1.75

3) Standard Error , SE = s/√n =   45.0000   / √    25   =   9

32)

sample mean difference = (-4-2+3)/3=-3/3 = -1

D. 3/3 = 1.0 (or -1)

31)

A. A large difference between sample means and a small estimated standard error