INFERENTIAL STATISTICS FOR DECISION MAKING

There were 171 seniors, 165 juniors, 275 sophomores, and 334 freshmen enrolled at a small college.

1. In Data Set 2.1, what is the probability of picking a student at random and getting a freshman?
2. In Data Set 2.1, what is the probability of picking a student at random and getting either a junior or a senior?
3. What is the nature of the Data Set 2.1 (Describe)

Data Set 3.1
A population of scores was normally distributed with a mean of 25 and a standard deviation of 4.

4. Look at Data Set 3.1 What is the proportion that scored between 30 and 27?
5. For Data Set 3.1, what is the range of scores that separate the middle 60 percent from the extremes? (Lower and upper score)
6. Look at Data Set 3.1 What is the proportion of the distribution with scores of 30 or more?