Question

Do Americans trust advertisements? A survey asked Americans who view advertisements at least once a month how honest the advertisements that they see, read, and hear are. The results were:

	Geographical Region
Honest?	Northeast	Midwest	South	West	Total
Yes	102	118	220	115	555
No	74	93	135	130	432
Total	176	211	355	245	987

1. Develop and populate a frequency and percentage table to show the number and percentage differences between areas of the country on their perspective of honesty in commercials.
2. Is there evidence of a significant difference among the areas of the country on their perspective of the honesty in commercials. Use the probability of 0.05.
3. Determine the p-value and interpret its meaning.
4. If appropriate, use the Marascuilo procedure and p=0.05 to determine which regions of the country differ.

Answer 1

a)

b)

Critical value X^2 = 7.8147

chi square stat > chi square critical, so we reject null hypothesis.

so it is clear to conclude that  there is a significant difference among the areas of the country on their perspective of the honesty in commercials

c)

p value = 0.003554 from chi-square

p value < 0.05 that means reject null hypothesis and it concludes that there is a significant difference among the areas of the country on their perspective of the honesty in commercials