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

Question

A researcher has developed a new drug designed 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 of time, the reduction in blood pressure for each subject was recorded. A summary of these data is: Treatment group (new drug): 21 23.48 8.01 Control group (old drug): 23 18.52 7.15 Which of the following is the approximate number of degrees of freedom for the t-procedures using software? Answer A. 40 B. 30 C. 35 D. 100

Explanation / Answer

the degrees of freedom for t procedures is n1+n2-2= 21+23-2= 44-2= 42.... thus approximately it is equal to 40... hence the answer is a) 40.. please rate and reward:)

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