The Centers for Disease Control (CDC)would Like to Test the Hypothesis

question 20

Multiple Choice

The Centers for Disease Control (CDC) would like to test the hypothesis that the proportion of obese adults in the U.S. has increased this year when compared to last year. A random sample of 125 adults this year found that 56 were obese. Last year, a random sample of 140 adults found that 42 were obese. If Population 1 is defined as this year and Population 2 is defined as last year, which one of the following statements is true?

• A)Because the 98% confidence interval includes zero, the CDC cannot conclude that the proportion of obese adults in the U.S. has increased this year when compared to last year.
• B)Because the 98% confidence interval does not include zero, the CDC cannot conclude that the proportion of obese adults in the U.S. has increased this year when compared to last year.
• C)Because the 98% confidence interval does not include zero, the CDC can conclude that the proportion of obese adults in the U.S. has increased this year when compared to last year.
• D)Because the 98% confidence interval includes zero, the CDC can conclude that the proportion of obese adults in the U.S. has increased this year when compared to last year.

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