Question

In what ways do advertisers in magazines use sexual imagery to appeal to youth? One study classified each of 1500 full-page or larger ads as "not sexual" or "sexual," according to the amount and style of the dress of the male or female model in the ad. The ads were also classified according to the age group of the intended readership. Here is a summary of the data.

	Magazine readership age group
Model dress	Young adult	Mature adult
Not sexual (percent)	72.4%	75.8%
Sexual (percent)	27.6%	24.2%
Number of ads	1000	500

Perform the significance test that compares the model dress for the age groups of magazine readership. Summarize the results of your test. (Use ? = 0.05. Round your ?² to three decimal places and round your P-value to four decimal places.)

?2	=
P-value	=

Answer 1

applying chi square test:

Observed	OBS	young adult	mature adult	Total
	not sexual	724	379	1103
	sexual	276	121	397
	Total	1000	500	1500
Expected	Ei=?row*?column/?total	young adult	mature adult	Total
	not sexual	735.333	367.667	1103
	sexual	264.667	132.333	397
	Total	1000	500	1500
chi square	=(Oi-Ei)2/Ei	young adult	mature adult	Total
	not sexual	0.17	0.35	0.52
	sexual	0.49	0.971	1.46
	Total	0.66	1.32	1.980

=1.980

p value =0.1594