18. In order to determine the effects of energy drinks on women's running speed, researchers gave 300 women an energy drink and then recorded the time it took each of them to run 2 miles. After collecting the results, researchers concluded that energy drinks increase the speed of running in women. Which of the following further tests would best help to support this conclusion? Repeat the same experiment, using 300 men.
Answer: B
Repeating the experiment with men running different distances provides valuable comparative data.
To further support the conclusion that energy drinks increase running speed in women, testing men with different running distances allows researchers to examine whether the effect of energy drinks is consistent across genders and varying physical demands.
A) Repeat the experiment, giving half of the men water and the other half the energy drink.
While this option introduces a control group, it would not effectively compare the impact of energy drinks on men specifically against the findings from women. It does not address the original question of gender differences in response to energy drinks.
B) Repeat the experiment having half of the men run 2 miles and the other half run 5 miles.
This approach is beneficial as it allows for comparison of running performance across different distances. It examines how energy drinks may affect running speed in men, thereby providing relevant data to compare with the results obtained from women. This can help in understanding if gender differences influence the effects of energy drinks.
C) Repeat the experiment, giving the men two different energy drinks.
Although testing two different energy drinks could provide insights into which formulation may be more effective, it does not address the need to compare the effects of energy drinks on men relative to the original findings with women. Thus, it does not directly support the conclusion regarding gender.
D) Repeat the experiment, giving the men two different energy drinks.
This option is a repeat of option C and has the same reasoning. Testing differing energy drinks does not yield a direct comparison of running speeds between genders and, therefore, does not effectively support the conclusion.
Conclusion
Option B is the most appropriate choice as it allows for a controlled comparison between men running different distances, thus providing data that can validate or challenge the initial findings with women. The other options either fail to compare gender effects directly or do not align with the goal of further supporting the conclusion regarding the impact of energy drinks on running speed.