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Problem 4. A researcher is comparing the effectiveness of two sets of instructions for assembling a book shelf A sample of 24
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Answer #1

Answer:

a).

t test for two independent sample to be used because Two different groups are compared.

b).

Group Statistics

Group

N

Mean

Std. Deviation

Std. Error Mean

time

Written Graphic

12

20.7500

5.41253

1.56246

Written

12

30.8333

5.25415

1.51674

Independent Samples Test

Levene's Test for Equality of Variances

t-test for Equality of Means

F

Sig.

t

df

Sig. (2-tailed)

Mean Difference

Std. Error Difference

95% Confidence Interval of the Difference

Lower

Upper

time

Equal variances assumed

.005

.944

-4.631

22

.000

-10.08333

2.17757

-14.59933

-5.56734

Equal variances not assumed

-4.631

21.981

.000

-10.08333

2.17757

-14.59956

-5.56711

c).

cohen d = (30.8333-20.75)/sqrt((5.41253^2+5.25415^2)/2)

=1.89041

d).

The 12 participants in the Written Graphic group (M = 20.8, SD = 5.4) and the 12 participants in the Written group (M = 30.8, SD = 5.3), demonstrated a significant difference in time taken (t[22] = -4.63, p < .01), d=1.89.

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