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, the reduction in blood pressure for each subject was recorded. A summary of these data is: n sample mean s Treatment group (new drug): 21 23.48 8.01 Control group (old drug): 23 18.52 7.15 If we had used the more accurate software approximation to the degrees of freedom, we would have used which of the following for the approximate number of degrees of freedom for the t procedures? A.) 40 B.) 100 C.) 37 D.) 38

          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, the
reduction in blood pressure for each subject was recorded. A
summary of these data is:
                 
                 
            n    
 sample mean      s
Treatment group (new drug): 21     23.48    
             8.01
Control group (old drug):       23    
     18.52            
7.15
If we had used the more accurate software approximation to the
degrees of freedom, we would have used which of the following for
the approximate number of degrees of freedom for the t
procedures?
A.) 40
B.) 100
C.) 37
D.) 38

Added by David H.

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