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
35	42	56
32	39	42
34	39	53
35	55	60
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

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

The hypothesis of identical means can definitely be ___________ . There is ________ 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 ________ the other groups.

Answer 1

Using Minitab: One way ANOVA:

First Enter the Data in Minitab:

Steps: For One Way ANOVA:

Stat-->ANOVA-->One Way ANOVA(Ustacked)

Here unstacked means we are using data of different column of Groups.

Select all groups in Responses Box and click on Comparison for Pairwise comparisons.

Then tick on Tuke's for pairwise comparisons.

Output:

Complete ANOVA table:

(1):

(2):

3): Yes, there a difference in the mean attention span of the children for the various commercials.

The hypothesis of identical means can definitely be ___rejected___ . There is _a significant difference_ in the mean attention span.

Pairwise Comparison:

which lines(intervals) not contains zero, it is means there is a significant difference between the groups.

(4): Yes, there significant differences between pairs of means.

Clothes have a mean attention span of a least ten minutes ____Toys____ the other groups.