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A researcher in biochemistry is attempting to summarize the results of an experiment. The experiment involved measuring enzyme active under a variety of conditions. The analysis has yielded the following statistics:

n 10 
Median 157.00 
Mean 163.50 
Variance 45.29 
Std. Error 2.13 
Range 38.00 


A two-sided 95% confidence interval for the mean enzyme activity is:
Answer a. (158.7, 168.3) 
b. (158.8, 168.2) 
c. (154.9, 159.1) 
d. (152.2, 161.8) 
e. (161.4, 165.6)  

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