To get enough calcium for optimal bone health, tablets containing calcium are of

Question

To get enough calcium for optimal bone health, tablets containing calcium are often recommended to supplement the a the diet. One study designed to evaluate the effectiveness of a supplement followed a group of young people for seven years. Each subject was assigned to take either a tablet containing 1000 milligrams of calcium per day (mg/d) or a placebo tablet that was identical except that it had no calcium. A major problem with studies like this one is compliance subjects do not always take the treatments assigned to them. In this study, the compliance rate declined to about 47% toward the end of the seven-year period. The standard deviation of compliance was 22%. Calcium from the diet averaged 850 mg/d with a standard deviation of 330 mg/d. The orrelation between compliance and dietary intake was 0.68 Suppose that people who have high intakes of calcium in their diets are more compliant than those who have low intakes. What effect would this have on the calculation of the standard deviation for the total calcium intake? Explain your answer This would imply a negative coelation between calcium intake and compliance, thus the variance of total calcium intake is greater than the variance we would see if there were no correlation This would imply a negative coelaion between calcium intake and compliance, thus the variance of total calcium intake is less than the variance we would see if there were no correlation This would imply a positive correlation between calcium intake and compliance, thus the variance of total calcium intake is greater than the variance we would see if there were no correlation This would imply a positive correlation between calcium intake and compliance, thus the variance of total calcium intake is less than the variance we would see if there were no correlation This would imply no correlation between calcium intake and compliance, thus the variance of total calcium intake is greater than the variance we would see if there were any correlation

Explanation / Answer

This statement would imply a positive correlation between Calcium intake and Compliance and hence, variance would be less.

Option 4 is correct.

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