Determine the upper-tail critical value $t_{\alpha/2}$ in each of the following circumstances.
a. $1-\alpha=0.90$, $n=30$
b. $1-\alpha=0.95$, $n=30$
c. $1-\alpha=0.90$, $n=46$
d. $1-\alpha=0.90$, $n=39$
e. $1-\alpha=0.99$, $n=59$
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Critical Values for the t Distribution (Page 1)
a. $t=$ (Round to four decimal places as needed.)