Solution :
Given that,
c = 95% = 0.95
n = 15
d.f. = n - 1 = 15 - 1 = 14
= 1 - 0.95 = 0.05
/ 2 = 0.025
1 - ( / 2) = 0.975
The critical value,
Now , using chi square table ,
= 0.025,14 = 26.119
= 0.975,14 = 5.629
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