Question: 1. The Department of Education wishes to estimate the proportion of all college students who have a job o↵-campus. It surveyed 1600 randomly selected students; 451 had such jobs. The population of interest to the Department of Education is:

Answer: 1. (c) All college students.

Question: Problems 2 through 4 pertain to the following sample data:

3, 2, 1, 0, 5, 3, 2, 0, 1

2. The mean of this data set is about

3. The median of this data set is

4. The sample standard deviation of this data set is about

Answer: 2. (a) 0.1

3. (a) 0

4. (e) 2.6

Question: 5. The standard deviation of a numerical data set measures the

Answer: 5. (a) variability

Question: 6. The distribution of the lengths of a commercially caught fish is bell-shaped with mean 26.8 cm and standard deviation 4.8 cm. Any fish measuring less than 22.0 cm must be released. The proportion of fish that must be released is about

Answer: 6. (c) .16

Question: 7. The score made by a particular student on a national standardized exam is the 65th percentile. This means that

Answer: (c) About 65% of all scores on the exam were lower than his.