1- An experiment is designed to study the effect of calcium and vitamin D supple

Question

1- An experiment is designed to study the effect of calcium and vitamin D supplements on the bones of first-year college students. The outcome measure is the total body bone mineral content (TBBMC), a measure of bone health. Three doses of calcium will be used: 0, 200 and 400 milligrams per day. The doses of vitamin D will be 0, 50 and 100 units per day. The calcium and vitamin D will be given in a single tablet. All tablets, including those with no calcium and no vitamin D, will look identical. Subjects for the study will be 90 men and 90 women.
a) What are the factors and treatments for this experiment?
b) How would you randomize the 180 college students?
c) Is there a placebo in this experiment? Explain your answer.

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Explanation / Answer

1

a) What are the factors and treatments for this experiment?

The dependent variable is the bones of first-year college students

The factors are Calcium doses and Vitamin doses

b) How would you randomize the 180 college students?

We have 90 men and 90 women , so randomly select 3 groups of 30 men and 30 women each

and then give them calcium and vitamin doses

c) Is there a placebo in this experiment? Explain your answer.

Yes , as we are giving 0 calcium and 0 vitamin D tablets and the subjects would not know , this is a placebo effect where the subject thinks that it is consuming calcium and Vit D tablets where in fact they are not consuming any.

Please note that we can answer only 1 full question at a time , as per th answering guidelines

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