According to the Center for Disease Control (CDC), 49.4% of American adults 18 y
ID: 3320988 • Letter: A
Question
According to the Center for Disease Control (CDC), 49.4% of American adults 18 years old and over meet their Physical Activity Guidelines for aerobic physical activity (see http://www.cdc.gov/nchs/fastats/exercise.htm). The owners of a gym want to know if the proportion of their members who meet these requirements is higher than the national average. They took a random sample of 40 members and 28 met the CDC’s guidelines.
15 * State the null hypothesis:
A)p = .494
B) p = .18
C)p = 28
D)p = .55
16 * State the alternative hypothesis and the tail-test direction
A)p < .494; left-tail test
B)p < .494; right-tail test
C)p > .494; left-tail test
D) p > .494; right-tail test
Explanation / Answer
15) here as we are comparing with national average which is 49.4%
therfore 15) null hypothesis: option A)p = .494
16)alternative hypothesis and the tail-test direction : option D) p > .494; right-tail test
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