INTERPRET THE GRAPH : Description of the data: The data are from a study of weig

Question

INTERPRET THE GRAPH :

Description of the data:

The data are from a study of weight gain, where investigators randomly assigned

30 rats to three treatment groups: treatment 1 was a control (no additive); treatments 2 and 3 consisted of two different additives (thiouracil and thyroxin respectively) to the rats drinking water. Weight was measured at baseline (week 0) and at weeks 1, 2, 3, and 4.

Note: Due to an accident at the beginning of the study, data on 3 rats from the thyroxin group are unavailable.

Variable List:

ID, Treatment (1=Control, 2=Thiouracil, 3=Thyroxin),

Baseline Weight (Week 0), Weight at Week 1, Weight at Week 2,

Weight at Week 3, Weight at Week 4.

INTERPRET THE GRAPH : Description of the data: The data are from a study of weight gain, where investigators randomly assigned 30 rats to three treatment groups: treatment 1 was a control (no additive); treatments 2 and 3 consisted of two different additives (thiouracil and thyroxin respectively) to the rats drinking water. Weight was measured at baseline (week 0) and at weeks 1, 2, 3, and 4. Note: Due to an accident at the beginning of the study, data on 3 rats from the thyroxin group are unavailable. Variable List: ID, Treatment (1=Control, 2=Thiouracil, 3=Thyroxin), Baseline Weight (Week 0), Weight at Week 1, Weight at Week 2, Weight at Week 3, Weight at Week 4.

Explanation / Answer

Increase in weight is seen in all the three groups of rats.

By the end of week 1, the increase is slightly higher for the control group when compared to the rest two. Missing the data of 3 rats from Thyroxin group, the average increase in this group is almost as much as that in Thioura. The control group and the Thyroxi group shows a constant increase throughout the 4 weeks. But the Thyroxi group gaining more weight by the end of Week 3. Thyroxi group gains maximum weight by the end of the experiment. Thioura's weight gain is quite less when compared to rest two groups and the rate of gain falls with time. This group has minimum weight gain by the end of the experiment.

Thus, we can conclude that Thyroxi is best for weight gain, and Thioura decreases the rate of gaining weight.

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