Question 451651
Calculate the critical values for a two tailed and a one-tailed test. Assume that the data is normally distributed and the sample size is greater than 30. 

a. Alpha (α) = 0.05
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two-tail: -1.96 and +1.96
one-tail: -1.645 or +1.645
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b. Alpha (α)= 0.10
two-tail: -1.645 and +1.645
one-tail: -1.2856 or +1.2856
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Cheers,
Stan H.