For each sample, do a test for zero correlation.   a.    r = +.45, n = 20, α = .05, two-tailed test b.    r = −.35, n = 30, α = .10, two-tailed test c.    r = +.60, n = 7, α = .05, right-tailed test d.    r = −.30, n = 61, α = .01, left-tailed test Find the critical value of tα. Perform the t test and report your decision. (Round your answers to 3 decimal places. Negative values should be indicated by a minus sign.)   Sample t-calc t-crit decision   a       Ho b       Ho c       Ho d       Ho

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