What sample value of r would we need for statistical significance if
(a) n = 5 and a = .05 for a two-tailed test?
(b) n = 10 and a = .05 for a two-tailed test?
(c) n = 25 and a = .05 for a two-tailed test?
(d) n = 25 and a = .01 for a two-tailed test?
(e) n = 25 and a = .05 for a one-tailed test?
(f) n = 100 and a = .05 for a two-tailed test?
(g) n = 1000 and a = .05 for a two-tailed test?