## Exam-Style Question on Correlation## A mathematics exam-style question with a worked solution that can be revealed gradually |

Question id: 262. This question is similar to one that appeared on a GCSE Higher paper (specimen) for 2017. The use of a calculator is allowed.

The number of visitors to a cycle track and the number of drinks sold by a cafĂ© at the location are recorded in the table below.

Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday | |

Numver of visitors | 32 | 45 | 39 | 43 | 58 | 84 | 65 |

Drinks sold | 17 | 20 | 23 | 7 | 24 | 49 | 38 |

The data is shown in the following scatter diagram:

(a) Add Sunday's data to the scatter diagram.

(b) Draw, by eye, a line of best fit on the scatter diagram.

(c) Describe the relationship between the number of visitors and the number of drinks sold.

(d) Which particular day does not fit the relationship?

(e) If one day there were 50 visitors, estimate how many drinks would be sold.

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