## Exercise 1

Classify the following variables

- Daily hours of exercise.
- Nationality.
- Blood pressure.
- Severity of illness.
- Number of sport injuries in a year.
- Daily calorie intake.
- Size of clothing.
- Subjects passed in a course.

## Exercise 2

The number of injuries suffered by the members of a soccer team in a league were

```
0 1 2 1 3 0 1 0 1 2 0 1 1 1 2 0 1 3 2 1 2 1 0 1
```

Compute:

- Construct the frequency distribution table of the sample.
- Draw the bar chart of the sample and the polygon.
- Draw the cumulative frequency bar chart and polygon.

## Exercise 3

A survey about the daily number of medicines consumed by people over 70 shows the following results:

```
3 1 2 2 0 1 4 2 3 5 1 3 2 3 1 4 2 4 3 2 3 5 0 1 2 0 2 3 0 1 1 5 3 4 2 3 0 1 2 3
```

- Construct the frequency distribution table of the sample.
- Draw the bar chart of the sample and the polygon.
- Draw the cumulative relative frequency bar chart and polygon.

## Exercise 4

In a survey about the dependency of older people, 23 persons over 75 years were asked about the help they need in daily life. The answers were

```
B D A B C C B C D E A B C E A B C D B B A A B
```

where the meanings of letters are:

A No help. B Help climbing stairs. C Help climbing stairs and getting up from a chair or bed. D Help climbing stairs, getting up and dressing. E Help for almost everything.

Construct the frequency distribution table and a suitable chart.

## Exercise 5

The number of people treated in the emergency service of a hospital every day of November was

```
15 23 12 10 28 7 12 17 20 21 18 13 11 12 26 30 6 16 19 22 14 17 21 28 9 16 13 11 16 20
```

- Construct the frequency distribution table of the sample.
- Draw a suitable chart for the frequency distribution.
- Draw a suitable chart for the cumulative frequency distribution.

## Exercise 6

The following frequency distribution table represents the distribution of time (in min) required by people attended in a medical dispensary.

- Complete the table.
- Draw the ogive.

## Exercise 7

The following table represents the frequency distribution of the yearly uses of a health insurance in a sample of clients of a insurance company.

uses | clients |
---|---|

0 | 4 |

1 | 8 |

2 | 6 |

3 | 3 |

4 | 2 |

5 | 1 |

7 | 1 |

Draw the box plot. Study the symmetry of the distribution.

## Exercise 8

The box plots below correspond to the age of a sample of people by marital status.

- Which group has higher ages?
- Which group has lower central dispersion?
- Which groups have outliers?
- At which group is the age distribution more asymmetric?