Arthur is conducting a study on the preferred study options of students from East County College. He randomly selected 28 students from the college, and found that 25% of those surveyed preferred studying abroad. Assuming a 95% confidence level, which statement holds true? A.
As the sample size is appropriately large, the margin of error is 0.178.
B.
As the sample size is appropriately large, the margin of error is 0.15.
C.
As the sample size is too small, the margin of error cannot be trusted.
D.
As the sample size is too small, the margin of error is 0.15.

It appears that people who are mildly obese are less active than leaner people. one study looked at the average number of minutes per day that people spend standing or walking. among mildly obese people, the mean number of minutes of daily activity (standing or walking) is approximately normally distributed with mean 376 minutes and standard deviation 64 minutes. the mean number of minutes of daily activity for lean people is approximately normally distributed with mean 528 minutes and standard deviation 107 minutes. a researcher records the minutes of activity for an srs of 7 mildly obese people and an srs of 7 lean people. use z-scores rounded to two decimal places to answer the following: what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 mildly obese people exceeds 420 minutes? what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 lean people exceeds 420 minutes?