A group of 11 mice was given water, and another group of 10 mice was supplied wi

Question

A group of 11 mice was given water, and another group of 10 mice was supplied with diluted black coffee (coffee:water 1:1) as drinking fluids for five weeks. The composition of the diets and living conditions were similar for both groups of mice. Blood glucose was monitored weekly for all mice. After five weeks, there was no change in average body weight between groups. Results indicated that blood glucose concentrations increased significantly in the mice that drank water compared with those that were supplied with coffee. Finally, blood glucose concentration in the coffee group exhibited a 30 percent decrease compared with that in the water group.

1. What was hypothesis of this experiment? What question(s) was (were) the investigator asking?

2. Which is the control group? Why?

3. Which is the treatment group? Why?

4. Did the researchers follow the scientific method in their experimental design? Explain.

5. Do you think that there may be any possible biases or other problems in this experiment? Explain.

6. Based on the data, was the hypothesis supported, and what can you conclude from this experiment?

Explanation / Answer

1. Hypothesis : Effect of coffee on the glucose concentration in blood 2. Control : 11 group water mice 3. Treatment group : 10 group coffee mice. The mice which was supplied with test chemical (Coffee)is treated group. 4. Yes, they have followed scientific approach. They are maintaining a control group and a treated group. 5. No, it is a simple experiment designed to test the effect of coffee on the metabolism of glucose. 6. The coffee has shown its effect on the concentration of glucose in the blood. That is why mice which were given coffee has shown a 30% decrease in the glucose levels.

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