Question: When Salk measured the results he divided the babies into
When Salk measured the results, he divided the babies into three groups based on whether they had low (2510 to 3000 g), medium (3010 to 3500 g), or high (3510 g and over) birth weights. He then compared the infants from the heartbeat and silent nurseries separately within each birth-weight group. Why do you think he did that? (Remember that it would be easier to detect a difference in male and female pulse rates if all males measured 65 beats per minute and all females measured 75 than it would be if both groups were quite diverse.)
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