*The next four questions refer to the following:* A Lake Tahoe Community College instructor is interested in the average number of days Lake Tahoe Community College math students are absent from class during a quarter.

### Exercise 19

What is the population she is interested in?

**A.**All Lake Tahoe Community College students**B.**All Lake Tahoe Community College English students**C.**All Lake Tahoe Community College students in her classes**D.**All Lake Tahoe Community College math students

#### Solution

D

### Exercise 20

Consider the following:

In this case,

**A.**Variable**B.**Population**C.**Statistic**D.**Data

#### Solution

A

### Exercise 21

The instructor takes her sample by gathering data on 5 randomly selected students from each Lake Tahoe Community College math class. The type of sampling she used is

**A.**Cluster sampling**B.**Stratified sampling**C.**Simple random sampling**D.**Convenience sampling

#### Solution

B

### Exercise 22

The instructor’s sample produces an average number of days absent of 3.5 days. This value is an example of a

**A.**Parameter**B.**Data**C.**Statistic**D.**Variable

#### Solution

C

*The next two questions* refer to the following relative frequency table on hurricanes that have made direct hits on the U.S between 1851 and 2004. Hurricanes are given a strength category rating based on the minimum wind speed generated by the storm. (*http://www.nhc.noaa.gov/gifs/table5.gif* [link])

Category | Number of Direct Hits | Relative Frequency | Cumulative Frequency |
---|---|---|---|

1 | 109 | 0.3993 | 0.3993 |

2 | 72 | 0.2637 | 0.6630 |

3 | 71 | 0.2601 | |

4 | 18 | 0.9890 | |

5 | 3 | 0.0110 | 1.0000 |

Total = 273 |

### Exercise 23

What is the relative frequency of direct hits that were category 4 hurricanes?

**A.**0.0768**B.**0.0659**C.**0.2601**D.**Not enough information to calculate

#### Solution

B

### Exercise 24

What is the relative frequency of direct hits that were AT MOST a category 3 storm?

**A.**0.3480**B.**0.9231**C.**0.2601**D.**0.3370

#### Solution

B

*The next three questions refer to the following:* A study was done to determine the age, number of times per week and the duration (amount of time) of resident use of a local park in San Jose. The first house in the neighborhood around the park was selected randomly and then every 8th house in the neighborhood around the park was interviewed.

### Exercise 25

“‘Number of times per week’” is what type of data?

**A.**qualitative**B.**quantitative - discrete**C.**quantitative - continuous

#### Solution

B

### Exercise 26

The sampling method was:

**A.**simple random**B.**systematic**C.**stratified**D.**cluster

#### Solution

B

### Exercise 27

“‘Duration (amount of time)’” is what type of data?

**A.**qualitative**B.**quantitative - discrete**C.**quantitative - continuous

#### Solution

C