Page 192 - MAT KS3 Y8 Cambridge CheckPoint

18.5 Drawing conclusions

For question 4 work in a group of three or four.
i On your own, answer each part of the question.
ii Compare your descriptions, answers and explanations with those of the other members
of your group.
Discuss the different descriptions and explanations you gave and decide which ones are best.

4 A sports shop sells the rugby shirts of two teams, Scarlets and Dragons.
The line graph shows the number of rugby shirts the shop has in stock each week
over an 8-week period.
a Describe the trend in the sales of:
i Scarlets rugby shirts
ii Dragons rugby shirts.
b Do you think that the shop has enough Scarlets rugby shirts in stock for week 9?
Explain your answer.
c Do you think that the shop has enough Dragons rugby shirts in stock for week 9?
Explain your answer.

Number of rugby shirts in stock
over an 8-week period Dragons
80
Number of rugby shirts in stock 60
Scarlets
70

50
40
30
20
10

0 1 2 3 4 5 6 7 8 9 10
Week number

Summary

You should now know that: You should be able to:
★ A bar chart is an example of a frequency ★ Draw and interpret bar charts for discrete and
diagram in which the bars represent discrete continuous data.
or continuous data. ★ Draw and interpret frequency diagrams for
★ In a frequency diagram, bars can represent discrete and continuous data.
discrete or continuous data. ★ Draw and interpret pie charts.
★ A pie chart is a way of displaying data to show how ★ Compare proportions in two pie charts that
an amount is divided or shared. The angles in all the represent different totals.
sectors add up to 360°.
★ Draw and interpret simple line graphs for time series.
★ A line graph is a series of points that are joined
by straight lines. Line graphs are usually used to ★ Draw and interpret stem-and-leaf diagrams.
show how data changes over a period of time. ★ Interpret tables, graphs and diagrams for discrete
and continuous data, and draw conclusions, relating
★ A stem-and-leaf diagram is a way of showing data
statistics and findings to the original question.
in order of size.

190 18 Interpreting and discussing results