Section $6\mathrm{.}2$

In Exercises $7$ and $8,$ find the critical value $t_c$ for the given confidence level $c$ sample size $n.$

$7.c=0\mathrm{.}80,n=8$

$\frac{t^{80}}{\sqrt[\phantom{2}]{8}}=28\mathrm{.}29$

$8.c=0\mathrm{.}80,n=22$

$\frac{t_{80}}{\sqrt[\phantom{2}]{22}}=17\mathrm{.}45$