Find the value of 
needed to construct a two-sided confidence interval of the given level with the given sample size:
a. Level 90%, sample size 12.
b. Level 95%, sample size 7.
c. Level 99%, sample size 2.
d. Level 95%, sample size 29.
(a) 1.796
(b) 2.447
(c) 63.657
(d) 2.048
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