You intend to estimate a population mean with a confidence
interval. You believe the population to have a normal distribution.
Your sample size is 7.
Find the critical value that corresponds to a confidence level of
85%.
Answer: C=85%= 0.85 , n=7
Degree of freedom= n-1 = 7-1 =6
Now look into t table as follows to get critical value. Look for row headed df= 6 and column headed C = 0.85 and find corresponding value in body of table as follows.
Thus we get two critical value as follows
Critical value= 1.650 = (- 1.650 , 1.650)
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