Explain the Role of Margin of Error in Constructing a Confidence

question 42

Multiple Choice

Explain the Role of Margin of Error in Constructing a Confidence Interval
-Suppose a 95% confidence interval for turns out to be (130, 300) . To make more useful inferences from the data, it is desired to reduce the width of the confidence interval. Which of the following will result in a reduced interval width

• A) All of these.
• B) Increase the sample size.
• C) Decrease the confidence level.
• D) Increase the sample size and decrease the confidence level.

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