The objective of a study is to understand the factors that are associated with s

Question

The objective of a study is to understand the factors that are associated with systolic blood pressure in infants. Systolic blood pressure, weight (ounces) and age (days) are measured in 100 infants. A multiple linear regression is performed to predict blood (mm Hg) from age and weight. The following results are presented in a journal articles.

A. How much higher would you expect the blood pressure to be of an infant who weighted 120 ounces compared to an infant who weighted 90 ounces if both infants were of exactly the same age?

B. Suppose the R2 from the above regression model is 0.57, which means that roughly 57% of the variability in the infant’s blood pressure measurements is explained by infant’s age and weight. What would happen to this R2 value, if weight had been recorded as kilograms instead of ounces?

a. R2 would go increase

b. R2 would decrease

c, R2 would equal 0.57

d. Not enough information to determin.

Explanation / Answer

A. The higher blood pressure expected to be 3.0 mm Hg.

B.  R2 would decrease if weight had been recorded as kilograms instead of ounces

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