Question

A study of the effect of television commercials on 12-year-old children measured their attention span, in seconds. The commercials were for clothes, food, and toys.

Clothes	Food	Toys
28	38	53
16	41	44
51	42	48
35	52	56
28	47	63
31	42	53
17	34	48
31	43	58
20	57	47
	47	51
	44	51
	54

1-) Complete the ANOVA table. Use 0.05 significance level. (Round the SS and MS values to 1 decimal place and F value to 2 decimal places.)

Source	df	SS	MS	F	p
Factors
Error
Total

2-) Find the values of mean and standard deviation. (Round the mean and standard deviation values to 3 decimal places.)

Level	N	Mean	StDev
clothes
food
toys

3-) Is there a difference in the mean attention span of the children for the various commercials?

The hypothesis of identical means can definitely be________________(rejecet/not. rejecet) there is_________ ( a difference/ no difference) in the mean attention span.

4-) Are there significant differences between pairs of means?

Clothes have a mean attention span of a least ten minutes ________ (above/belove) the other groups.

Answer 1

1)

anova table
	SS	df	MS	F	p-value
Between:	2819.7361	2	1409.8681	23.89	0.0000
Within:	1711.1389	29	59.0048
Total:	4530.8750	31

2)

SUMMARY
Groups	Count=N		Mean		std dev
Clothes	9		28.556		10.737
Food	12		45.083		6.680
Toys	11		52.000		5.459

3) The hypothesis of identical means can definitely be_______rejected_________ there is_____a difference ____ in the mean attention span.

4) Clothes have a mean attention span of a least ten minutes ____below __ the other groups.