In the following exercises you have to choose the most suitable graph to represent the data contained in the tables. If necessary, read up on the information about the different graphs again in the learn section. Choose the correct answer from the suggested answers provided, hit the solution button, and finally discover the correct answer and the reason for that solution.

Remember to use the 3 steps:

**Step 1: Look at title, words and pictures. What does the table show?
**

**Step 2: Look at the numbers. What do the numbers tell you?**

**Step 3: Choose a type of graph for this data. What kind of graph would you choose to effectively represent the data?**

### Exercise 1 – Students’ food likes

60 Students in a school have been interviewed about their food likes. Here below the table shows their answers:

Food | Students |

A.Pizza | 20 |

B. Spaghetti Bolognese | 15 |

C. Sausages | 6 |

D. Potato Salad | 3 |

E. Baked Beans on toast | 2 |

F. Lasagna | 10 |

G. Roast turkey | 4 |

Total number of students asked: | 60 |

### Now let´s try out the 3 steps:

#### Step 1: Look at title, words and pictures. What does the table show?

#### Step 2: Look at the numbers. What do the numbers tell you?

Can you figure out the total number of students that have been asked?

Where do you find highest numbers /scores?

Where are the lowest numbers?

The highest scores you can find are for the Italian food: Pizza, Spaghetti Bolognese followed by Lasagna.

Beans on toast scores lowest, it is least liked by the students that have been asked.

#### Step 3: Choose a type of graph for this data. What kind of graph would you choose to represent effectively this data?

- bar chart
- pie chart
- web diagram

**pie chart**is the best solution.

### Exercise 2 – Jobs and their characteristics

If you think about your future and you think about the work you would like to do, you can read up on characteristics needed for a certain job. Thus making it easier to decide what kind of job you would like to do or you might be good at.

The table below contains the opinions collected for a survey by the employment service center.

**1** = not important | **2** = needed sometimes | **3 **= important | **4 **= very important

Patience | Precision | Organisation | Tidiness | Helpfulness | Teamplayer | |

Electrician | 1 | 4 | 2 | 1 | 2 | 2 |

Nurse | 3 | 4 | 3 | 4 | 4 | 3 |

Teacher | 4 | 3 | 4 | 1 | 4 | 0 |

Chef | 2 | 3 | 4 | 4 | 1 | 4 |

### Now let´s try out the 3 steps:

#### Step 1: Look at title, words and pictures. What does the table show?

It shows characteristics: patience, precision, organisation, tidiness, helpfulness, team player

#### Step 2: Look at the numbers. What do the numbers tell you?

#### Step 3: Choose a type of graph for these data. What kind of graph would you choose to represent effectively these data?

Looking at the table is quite hard work and it would take some time to read it.

What kind of graph would you use to give an easier overview?

- bar chart
- line chart
- web diagram
- area diagram

**A web diagram**is the best solution, as it is usually used for target performance and in our example the different jobs and the importance of the different characteristics can be shown in this diagram. There are 4 different jobs and 6 different characteristics. Therefore a bar chart would be possible, but as there are so many characteristics, it would be rather confusing. As there is no time characteristic to show trends, neither a line chart nor an area diagram is a good option.

### Exercise 3 – Media use

Studies often focus on differences in behaviour depending on your gender. In this study you can read about different ways that students primarily access information.

Here below the table shows the answers of students that have been asked:

Media | Students male | Students female |

TV | 25 | 32 |

PC | 13 | 35 |

Smartphone | 42 | 20 |

Tablet | 12 | 34 |

Radio | 40 | 23 |

Books | 3 | 5 |

Newspapers | 2 | 2 |

Magazines | 6 | 14 |

143 | 165 |

#### Step 1: Look at title, words and pictures. What does the table show?

#### Step 2: Look at the numbers. What do the numbers tell you?

Male students in this survey prefer smartphones and radio, they hardly use books, newspapers and magazines.

Female students in this survey prefer TV, PC and Tablet, they hardly read newspapers and books.

The dislikes are very similar for both genders, with the only variance being that female students like magazines.

#### Step 3: Choose a type of graph for this data. What kind of graph would you choose to represent effectively this data?

What kind of graph would you use to show differences effectively?

- group bar chart
- line chart
- web diagram
- pie chart

**group bar chart**is the best solution, as you can differentiate between 3 characteristics. In this example media, the number of uses and the gender can all be shown and compared.

### Exercise 4 – Following Social Media

Do you use social media? What kind do you use? And for how many hours per day? In this table you can find the likes of students and average hours per day that they use it.

social media | Nombre de personnes | Moyenne du nombre d’heure/j |

30 | 9 | |

25 | 8 | |

18 | 5 | |

youtube | 30 | 3 |

5 | 1 | |

skype | 9 | 1 |

#### Step 1: Look at title, words and pictures. What does the table show?

#### Step 2: Look at the numbers. What do the numbers tell you?

Facebook and Whatsapp used the most hours per day, with Instagram and Skype used the least amount of hours per day.

Maximum average hours per day 9 and minimum average hours per day: 1

This survey does not give a total of numbers being asked.

#### Step 3: Choose a type of graph for these data. What kind of graph would you choose to represent effectively these data?

What kind of graph would you use to show differences effectively?

- pie chart
- area digram
- web diagram
- bubble chart

**bubble chart**is the best solution as this shows a good statistical spread where we want to compare 3 characteristics.

### Exercise 5 – How do you get to school?

Students were asked what means of transportation they use to get to school.

Mode of transportation | Number of students |

Train | IIIII |

Bus | III |

Walking | IIIII II |

Bycicle | IIIII II |

Blades / Skateboard | III |

Tram/Tube | IIIII II |

Car | IIIII |

Motorcyle | III |

#### Step 1: Look at title, words and pictures. What does the table show?

#### Step 2: Look at the numbers. What do the numbers tell you?

Train | 5 |

Bus | 3 |

Walking | 7 |

Bycicle | 7 |

Blades / Skateboard | 3 |

We know that most people walk, use a bycicle or go by tram or tube. Less people go by bus, motorcycle, blades or skateboard. We do not know how many people have been asked as some might use two or more means of transport to get to school, e.g. they get a lift half way by their parents and walk the rest.

#### Step 3: Choose a type of graph for this data. What kind of graph would you choose to represent effectively this data?

What kind of graph would you use to show differences effectively?

- pie chart
- bar chart
- web diagram
- line chart

**bar chart 1.**There is more than one answer possible but it is best not to use a pie chart.

If you like, you could try and display your data as a Bar Graph, Line Graph or Pie Chart and print it: http://www.mathsisfun.com/data/data-graph.php