DSC04979

00

^napier ±z: une-way /\naiy»i» oi vanance

TABLE 12.4 Piano lesson data

Lessons    Scores

Piano	2	5	7	Bp	2	7	4	1	0	7
	3	4	3	4	9	4	5	2	9	6
	0	3	6	-1	3	4	6	7		7
	-3	3	4	4
Singing	1	Hi	0	1	E	0	0	1	0	-1
Computer	0	1	1	-3	-2	4	-1	2	4	2
	2	2	-3	-3	0	2	0	-1	3	-1
Nonę	5	-1	7	0	4	0	2	1	-6	0
	2	n	0	-2

12.19    Refer to the previous exercise. Use the Bonferroni or another multiple comparisons procedurę to compare the group means. Summarize the results and support your conclusions with a graph of the means.

12.20    The researchers in Exercise 12.18 based their research on a biological argument for a causal link between musie and spatial-temporal reasoning. Therefore, it is natural to test the contrast that compares the mean of the piano lesson group with the average of the three other means. Construct

tViig rnntrggt rw^r-frn-m tlip gicmifinar>nf> tf*gtanH gummnHtł-u=> ryaculfrcMrtfp