Sandra B.

asked • 17d

PLEASE HELP. According to a recent study by the Annenberg foundation, only 36%...

According to a recent study by the Annenberg foundation, only 36% of adults in the United States could name all three branches of government. This was based on a survey given to a random sample of 1416 US adults.

[a] What is the standard deviation of the sample?

a) 3.6%

b) 3%

c) 3.2%

d) 40%

[b] What is the critical value for a 90% confidence interval?

a) 1.645

b) 2.56

c) 1.5

d) 3.54

[c] Given a critical value of 1.645 for a 90% confidence interval and a standard deviation of .032, what is the confidence interval for the point estimate of 36% from the sample of 1416?

a) 31.76% to 42.25%

b) 36.25% to 36.75%

c) 40.25% to 44.25%

d) 36.45% to 44.45%

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