Question: A and C were marked incorrect. Is D the correct answer? 31. If 90% and 95% confidence intervals were developed to estimate the true cost

A and C were marked incorrect. Is D the correct answer?

31. If 90% and 95% confidence intervals were developed to estimate the true cost of the DVD, what similarities do they have?

a Both require point estimates of the true cost.
b Both use z statistics.
c Both require standard errors of the true cost.
d All are true.

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