How Much Alcohol Do College Students Drink? According to the website www.collegedrinkingprevention.gov, “About 25 percent of college students report academic consequences of their drinking including...

How Much Alcohol Do College Students Drink?

According to the website www.collegedrinkingprevention.gov, “About 25 percent of college students report academic consequences of their drinking including missing class, falling behind, doing poorly on exams or papers, and receiving lower grades overall.” A statistics student is curious about drinking habits of students at his college. He wants to estimate the mean number of alcoholic drinks consumed each week by students at his college. He plans to use a 90% confidence interval. He surveys a random sample of 71 students. The sample mean is 3.93 alcoholic drinks per week. The sample standard deviation is 3.78 drinks.

Here is an applet you can use when directed to find the critical T-value.
Note: the "Central Probability" is the area of the middle shaded region.

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