The American Heart Association is about to conduct an anti-smoking campaign and
ID: 3359066 • Letter: T
Question
The American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 35 who smoke.
Step 1 of 2: Suppose a sample of 632 Americans over 35 is drawn. Of these people, 456 don't smoke. Using the data, estimate the proportion of Americans over 35 who smoke. Enter your answer as a fraction or a decimal number rounded to three decimal places.
Step 2 of 2: Suppose a sample of 632 Americans over 35 is drawn. Of these people, 456 don't smoke. Using the data, construct the 90%confidence interval for the population proportion of Americans over 35 who smoke. Round your answers to three decimal places.
Explanation / Answer
The statistical software output for this problem is:
One sample proportion summary confidence interval:
p : Proportion of successes
Method: Standard-Wald
90% confidence interval results:
Hence,
1. Estimate of proportion = 0.722
2. 90% confidence interval: (0.692, 0.751)
Proportion Count Total Sample Prop. Std. Err. L. Limit U. Limit p 456 632 0.72151899 0.017830484 0.69219045 0.75084752Related Questions
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