1.1. John wants to investigate whether men in the UK are better at estimating a time interval of 10 seconds than women in the UK. He decides to sample the population by asking his work colleagues to take the test.

The diagrams below summarise John’s results.

What information from the diagrams can be used to support each of these statements?

i) The older John’s colleagues are, the lower their estimate is.

[1]

ii) Males in the sample tend to underestimate the interval and females in the sample tend to overestimate the interval.

[2]

1.2. Comment on whether any conclusions can be drawn for the UK population from the results of this sample.