Free Types of statistical studies Practice Problems • Learn To Be

A nutritionist had a hypothesis that eating a single banana an hour before a marathon (a

42\text{-km}

run) can improve performance and reduce running time. To test her hypothesis, she randomly assigned a group of

360

men about to participate in a marathon to two groups.

One group was instructed to eat a single banana an hour before the race, and the other group was instructed to eat nothing during the few hours before the race. After the race was done, she compared the average running times of the two groups.

What type of statistical study did the nutritionist use?

The nutritionist found that the average running time of the group who ate a banana was

5

minutes shorter than the running time of the group who hadn’t.

What valid conclusions can be made from this result?

Mark the most suitable choice.

Choose 1 answer:

A
The result suggests there’s a correlation between eating a single banana before a marathon and reduction in running time for male runners.
B
The result suggests that a male runner will likely run a faster marathon if he eats a banana an hour before the race as opposed to eating anything else.
C
The result suggests that a male runner will likely run a faster marathon if he eats a banana an hour before the race as opposed to eating nothing.
D
The result suggests that any runner will likely run a faster marathon if they eat a banana an hour before the race as opposed to eating nothing.

Types of statistical studies

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