*The next three questions refer to the following information.* We are interested in the number of years students in a particular elementary statistics class have lived in California.
The information in the following table is from the entire section.

Number of years | Frequency |
---|---|

7 | 1 |

14 | 3 |

15 | 1 |

18 | 1 |

19 | 4 |

20 | 3 |

22 | 1 |

23 | 1 |

26 | 1 |

40 | 2 |

42 | 2 |

Total = 20 |

### Exercise 24

What is the IQR?

**A.**8**B.**11**C.**15**D.**35

#### Solution

A

### Exercise 25

What is the mode?

**A.**19**B.**19.5**C.**14 and 20**D.**22.65

#### Solution

A

### Exercise 26

Is this a sample or the entire population?

**A.**sample**B.**entire population**C.**neither

#### Solution

B

*The next two questions refer to the following table.*

x | Frequency |
---|---|

0 | 3 |

1 | 12 |

2 | 33 |

3 | 28 |

4 | 11 |

5 | 9 |

6 | 4 |

### Exercise 27

The 80th percentile is:

**A.**5**B.**80**C.**3**D.**4

#### Solution

D

### Exercise 28

The number that is 1.5 standard deviations BELOW the mean is approximately:

**A.**0.7**B.**4.8**C.**-2.8**D.**Cannot be determined

#### Solution

A

*The next two questions refer to the following histogram.* Suppose one hundred eleven people who shopped in a special T-shirt store were asked the number of T-shirts they own costing more than $19 each.

### Exercise 29

The percent of people that own at most three (3) T-shirts costing more than $19 each is approximately:

**A.**21**B.**59**C.**41**D.**Cannot be determined

#### Solution

C

### Exercise 30

If the data were collected by asking the first 111 people who entered the store, then the type of sampling is:

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

#### Solution

D

Comments:"Reviewer's Comments: 'I recommend this book. Overall, the chapters are very readable and the material presented is consistent and appropriate for the course. A wide range of exercises introduces […]"