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1. The Pew Research Center conducted a survey of 897 adults and found that 76% of them are aware of Instagram. Construct a 93% confidence interval estimate of the proportion of adults who are aware of Instagram. What is the lower bound of the confidence interval? (Round to the nearest thousandth.) Enter answer 2. The Pew Research Center wishes to estimate the proportion of adults who are aware of Instagram. Assume that a recent Instagram publication indicates that 69% of adults are aware of Instagram. How many adults must the marketing firm randomly survey if they want to be 90% confident that the proportion of adults who are aware of Instagram is within 2% of the true proportion of adults who are aware of Instagram? Enter answer
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Answer #1

Confidence interval for population proportion p is

p' +- z ( sqrt (p' (1-p')/n)

Where use z critical value from z table in 2 tail at 93% confidence.

Giiven data are Sample , Y ニ 31 at 93% conndence in g-tail -pvom Z-table 2略 ± ay)= +1.81 , The 93% confidence intuvalfov p ;s => 0.76 ± 1.81 80. 6(0.2u) 899 Low u boun d ;s =0.734

Sample n= (z/E)^2 (p (1-p))

Find z from z table at 90% confidence in 2 tail

Griven dat aave Population proportion. A %-o.69 E- margin of ET101: ax oo. at 90%, con兵dent in à-tail -from 2-table 2- CPCI-p) 0.0 2 (82-25 (213) 6365.o 6 25 (o2139) 2- oySound the Somple Nalve to the ext higest Nalue 1

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