An experiment investigated the effect of vitamin B12 on the weight gain of pigs.

Question

An experiment investigated the effect of vitamin B12 on the weight gain of pigs. The outcome measured was the amount of weight gained (in kilograms) over a four week period. Pigs were randomly assigned to one of two groups - one received a vitamin B12 supplement added to their food, the other group did not. Assume, also, that the pigs for the experiment were randomly sampled from a large population of eligible pigs. Which of the follow describe population parameters that could be estimated from this study? (Tick as many as apply.) erence of means in t The observed difference of means in weight gained (Vitamin B12 minus No vitamin B12. The true mean weight gained by pigs receiving the supplement. The observed mean weight gained by pigs receiving the supplement The true difference in the proportion of pigs gaining over 0.2kg (Vitamin B12 minus No vitamin B12). The observed difference in the proportion of pigs gaining over o.2kg (Vitamin B12 minus No vitamin B12)

Explanation / Answer

Ans : The true difference in means in weight gained ( Vitamin B12 minus No Vitamin B12)

Since the outcome is measured in the terms of weight gain of the pigs over the 4 months time period , the true difference of the means in weight gained can be measured.

The mean from both the groups is taken and then the difference is determined.

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