Based on past data, it is known that about 20.5% of people smoke cigarettes. Suppose we take a sample of 100 people currently and find that only 12% smoke cigarettes. We want to see if there is evidence that the percentage of people who smoke cigarettes is decreasing.

ROUND TO FOUR DECIMAL PLACES

Based on past data, it is known that about 20.5% of people smoke cigarettes. Suppose we take a sample of 100 people currently and find that only 12% smoke cigarettes. We want to see if there is evidence that the percentage of people who smoke cigarettes is decreasing.

ROUND TO FOUR DECIMAL PLACES

d. What is the critical value at 99% confidence?

e. Calculate the test statistic (using the sample of 100).

f. Find the p-value.

g. What conclusion would be made here at the 99% confidence level?

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