Results of a study on vitamins

Reference no: EM131015088

The data set vitamin .txt contains the results of a study on vitamins. Three groups of test subjects each received a different treatment (three different vitamin formulations). Each subject's calcium levels before and after treat ment were recorded.

(a) To reduce bias in the experiment, the subjects should have been assigned a treatment regimen at random.

i. Explain what this means.

ii. Using just the "before" calcium levels, how could we check if any obvious non-random assignment was used?

iii. Perform this check, and comment on the results.

(b) Make separate scatter plots for the three sets of data.

Reference no: EM131015088

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