A poll asked for peoples opinion on whether closing local ne

A poll asked for people\'s opinion on whether closing local newspapers would hurt civic life: 425 of 1006 respondents said it would hurt civic life a lot. Complete parts a through d below. life a lot (Round to three decimal places as needed.) e interval for the population proportion who believed closing b. Find a 95% confidenc newspapers would hurt civic life a lot. Assume the poll used a simple random sample (SRS). (In fact, it used random sampling, but a more complex method than SRS.) CD Round to three decimal places as needed) c. Find an 80% confidence interval for the population proportion who believed closing newspapers would hurt civic life a lot. Round to three decimal places as needed)

Solution

c) For 80%

Margin of error = 1.28(0.0156)

conf interval = (0.4025, 0.4424)

Option B is right.

a)	Sample prop	0.422465
b)	Std error for p	0.0156
	Margin of error	0.030524
	Con int LB	0.391941
	UB		0.452989