T4W9 TS Q38 – Selective High School

Mr Dunn wants to test out the hypothesis that students who drink energy drinks are faster sprinters than those who only drink water.

He chooses two groups of 30 students from Year 5 and 6.

Group 1 drinks water only.
Group 2 drinks energy drinks only.

After 4 weeks, a race is held. On average, Group 1 are faster sprinters than those in Group 2.

Mr Dunn: "Students who drink water are faster sprinters after all!"

Which of the following statements shows the mistake Mr Dunn has made?

Mr Dunn failed to consider everyone’s sprinting ability before the experiment. Energy drinks have added vitamin which is good for sprinters. Mr Dunn is not a nutritionist and therefore not qualified to conduct this experiment. Water does not contain any vitamins, which means it is better for everyone.

Are you sure you want to leave?

Which of the following statements shows the mistake Mr Dunn has made?