For a test with the null hypothesis Ho: μ = 70 against the alternative Ha: μ < 70, the following data are used to calculate a test statistic Z value: μ = 70, x(bar)=68, σ=5 and n=30. What is the critical value, zc, used for rejecting the null hypothesis Ho?
-2.25
-2.50
-1.96
-3.00
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