Global Warming In April of 2014, a Gallup Poll of 1048 U.S. adults found that 25% of the respondents were skeptical that global warming exists. For this poll a 95% confidence interval has a margin of error of +3%. What would be the margin of error for a 90% confidence interval? What's good and bad about this change?

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A: Solution According to guidelines we solve only first question

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A: Given  X=319, n=580,  We want to find the 99% CI for population proportion (p)

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A: Givenn=370x=333p^=333370=0.90

Q: A clinical trial tests a method designed to increase the probability of conceiving a girl. In the…

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Q: How's the economy? A pollster wants to construct a 95% confidence interval for the proportion of…

A: Given dataError = 3% = 0.03Confidence level = 0.95

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A: The confidence level is 98% Therefore, α = 0.02 and α/2=0.01. The margin of error is 0.03. Since the…

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A: Given Pcap=0.75 1-pcap=0.25 Margin of error (n) =4%=0.04