A recent study of alcohol drinking practices among college s

A recent study of alcohol drinking practices among college students found that the average number of drinks per week consumed was 3.5 with a standard deviation of 2.0. Suppose you examined the number of drinks per week consumed by a large sample of students from the population. Which of the following statements is true? (Assume the distribution of number of drinks per week is unimodal).

A.) Distribution is right skewed

B.) Distribution is left skewed

C.) The normal normal model would be a good description of these data

D.) About 2.5% of students in our sample would drink more than 7.5 per drinks per week

Solution

As sample size becomes large then mean of any distribution irrespective of its original shape, skewed right or left,

follows normal distribution approximately.

Hence c is the right answer.

C.) The normal normal model would be a good description of these data