Obtain the critical value (or values) for a hypothesis test for the mean if you conduct:
(a) an upper tail "z" test at the 1% level of significance.
(b) a two-tailed "z" test at the 1% level of significance.
(c) a lower tail "z" test at the 5% level of significance.
(d) a two-tailed "z" test at the 5% level of significance.
(e) an upper tail "z" test at the 10% level of significance.
(f) a upper tail "t" test with 17 d.f. at the 5% level of significance.
(g) a two-tailed "t" test with 17 d.f. at the 5% level of significance.
(h) a lower tail "t" test with 6 d.f. at the 1% level of significance.
(i) a two-tailed "t" test with 6 d.f. at the 10% level of significance.
(j) an upper tail "t" test with 6 d.f. at the 5% level of significance.
[Hint: remember it is often easier to read key "z" values from a t table than from a standard normal table.]