Question

Scenarios 79 The following data show the results of a matched- samples design. Half of the participants were in a control condition (C) and the other half were in a treatment condition (T). Participants on the same row were matched for IO. Participant (C) Control Participant (T) 151 Treatment 154 138 2 T3 1367 137 128 129 5 169 172 Mean 144.2 146.4 Variance 260.7 285.3 (a) Compute the 95% confidence interval around me (b) Compute the approximate 95% confidence interval around d. (c) Computer and the two-tailed p-value as- sociated with (d) State whether m, is statistically significant at the p<.05 level.

Answer 1

(a)

144.200	mean Control
146.800	mean Treatment
-2.600	mean difference (Control - Treatment)
1.517	std. dev.
0.678	std. error
5	n
4	df
-4.483	confidence interval 95.% lower
-0.717	confidence interval 95.% upper
1.883	margin of error

(b)

2.600	mean d
1.517	std. dev.
0.678	std. error
5	n
4	df
0.717	confidence interval 95.% lower
4.483	confidence interval 95.% upper
1.883	margin of error

(c) t value = 3.833

p-value = 0.0186

(d) md is statistically significant at 0.0186 < 0.05 level.

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