Which of the following statements is true regarding the width of a confidence interval for a population proportion?
A) It is narrower for 95% confidence than for 90% confidence.
B) It is wider for a sample of size 80 than for a sample of size 40.
C) It is wider for 95% confidence than for 99% confidence.
D) It is narrower when the sample proportion is 0.20 than when the sample proportion is 0.50.
D
Business
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When comparing the physical and the economic life of an improvement, the economic life usually is:
A: Shorter; B: Longer; C: The same; D: Shorter or longer, depending on the type of improvement.
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Each year, the majority of new products introduced fail
Indicate whether the statement is true or false
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