A manufacturer thinks her mean daily output is 450 units. A sample of 100 days reveals a mean of 432 units with δ2 = 4489. Testing the hypothesis at α = .05 which of the following statements are true.

A. The manufacturer should reject the null hypothesis.
b. To test the hypothesis, the correct Z test statistic for comparison is 1.645.
c. The standard error is 448.
d. The manufacturer’s statement is correct; the output is statistically the same as 450 at α = .05.