Question

The Gallup Poll conducted a representative telephone survey during the first quarter of 1999. Among their reported results was the following table concerning the preferred political party affiliation of respondents and their ages.

			Party
		Rep	Dem	Ind	Total
	18-29	241	351	409	1001
Age	30-49	299	330	370	999
	50-64	282	341	375	998
	65+	279	382	343	1004
	Total	1101	1404	1497	4002

a.What probability of people were Independents under the age of 30?

b.What probability of independents were under 30?

c.What probability of people under 30 were independents?

Answer 1

Party Age Deur Ind Total Rep x 1001 409 18-29 351 241 aag 30-49 299 330 370 375 998 50-64 282 34) 279 65+ 382 343 1004 Total 1101 1404 1497 4002 px Bob Yr to 1. do a) p (Independent of Angle, 30) = P( independent n Under 30) STO = P(ind n 18-29) 409 -0.1022 4002

b) PL <30 lind) pl 18-29 nind plind) 409 - = 0,2732 1497 c) pl ind I <30) = P(ind n 18-29) 409 -0.4086 1001 P(18-29)