• measures of central tendency
• frequency tables
• graphs (bar chart, histogram, scatter diagram)
•  normal distribution (including standard deviation) and skewed distribution
• sense checking data
• measures of dispersion (range, standard deviation)

Caroline carried out an experiment to see if men were better at hitting a target with a ball than women. 10 men and 10 women threw 50 balls each. She counted how many balls hit the target for each participant. She then worked out the mean number of hits for males and the mean number of hits for females. On average the males hit the target 30 times and the females hit the target 25 times.

(a) Using graph paper below, draw and fully label a bar chart to represent the data. (3)

Here are three brief exercises all about ‘Commenting on data’ to practice your exam skills:

percentages practice questions

Measures of central tendency practice questions (1)

Measure of dispersion practice questions

Answers to the dispersion exercise