A researcher has developed a new drug designated to reduce blood pressure. In an

Question

A researcher has developed a new drug designated to reduce blood pressure. In an experiment, 21 subjects were assigned randomly to the treatment group and received the new experimental drug. The other 23 subjects were assigned to the control group and received a standard, well-known treatment. After a suitable period, the reduction in blood pressure for each subject was recorded. A summary of these data is:
n xbar s
treatment group (new drug) 21 23.48 8.01
control group (old drug): 23 18.52 7.15

Without using software, how would you estimate the number of degrees for this problem?

use the smaller value, 21, chosen from the 2 options 21 and 23
use the larger value, 23, chosen from the 2 options 21 and 23
use the larger value, 22, chosen from the 2 options 20 and 22
use the smaller value, 20, chosen from the 2 options 20 and 22

Explanation / Answer

In an experiment, 21 subjects were assigned randomly to the treatment group and received the new experimental drug. The other 23 subjects were assigned to the control group and received a standard, well-known treatment.

The number of degrees for this problem:

use the smaller value, 20, chosen from the 2 options 20 and 22

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