Question

Multiple Comparisons
Dependent Variable:   Score
Tukey HSD
(I) Condition	(J) Condition	Mean Difference (I-J)	Std. Error	Sig.	95% Confidence Interval
					Lower Bound	Upper Bound
Condition A	Condition B	-3.100	1.657	.258	-7.56	1.36
	Condition C	-4.300	1.657	.062	-8.76	.16
	Condition D	-6.700*	1.657	.001	-11.16	-2.24
Condition B	Condition A	3.100	1.657	.258	-1.36	7.56
	Condition C	-1.200	1.657	.887	-5.66	3.26
	Condition D	-3.600	1.657	.150	-8.06	.86
Condition C	Condition A	4.300	1.657	.062	-.16	8.76
	Condition B	1.200	1.657	.887	-3.26	5.66
	Condition D	-2.400	1.657	.478	-6.86	2.06
Condition D	Condition A	6.700*	1.657	.001	2.24	11.16
	Condition B	3.600	1.657	.150	-.86	8.06
	Condition C	2.400	1.657	.478	-2.06	6.86
*. The mean difference is significant at the 0.05 level.

Interpret the Post Hoc test above.

	a.	Condition C is significantly higher than Condition A
	b.	Condition D is significantly lower than Condition A
	c.	Condition B is significantly lower than Condition C
	d.	Condition D is significantly higher than Condition A

Answer 1

'Correct choice is ad) Condition D is significantly higher than Condition A".

From the confidence intervals of the difference between the means we conclude that there is only one pair of conditions A and D which have a significantly different means.

Because the coonfidence interval for the difference of means of that pair does not include zero.

From the difference ( mean of condition A - mean of condition B ) we get negative value. Also the upper bount of this interval is -2.24 which is negative. So we can say that the mean of condition D is significantly greater than the mean ofcondition A.