Suppose That the Proportion of All American Adults That Fit

Multiple Choice

Suppose that the proportion of all American adults that fit the medical definition of being obese is 0.23. A large medical clinic would like to determine if the proportion of their patients that are obese is higher than that of all American adults. The clinic takes a simple random sample of 30 of their patients and finds that 9 patients in the sample are obese.
-Where is the distribution centered? Explain why this makes sense.

A) The distribution is centered around 7, since 23% of 30 is around 7.
B) The distribution is centered around 7, since 30% of 30 is around 7.
C) The distribution is centered around 0.23, since we are assuming the null hypothesis.
D) The distribution is centered around 0.30, since we are assuming the null hypothesis.