A poll asked for people\'s opinion on whether closing local newspapers would hur

Question

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)

Explanation / Answer

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

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