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Sampling, Confidence Intervals, Sample Sizes SKETCH required. PLACE ANSWER WITH PROBABILITY NOTATION IN RECTANGE. 5. A...

Sampling, Confidence Intervals, Sample Sizes
SKETCH required. PLACE ANSWER WITH PROBABILITY NOTATION IN RECTANGE.

5. A medical devices company wants to know the number of hours its MRI machines are used per day. A previous study found a standard deviation of four hours. How many MRI machines must the company study in order to have a margin of error of 0.5 hours when calculating a 98% confidence interval?
6. 2,007 adults were asked their preference for improving the sewer system in their town. 33% had a favorable preference. Construct a 95% confidence interval of the proportion of adults who view improving the sewer system as desirable.
Math   Statistics-And-Probability   
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5 Margin of error = 0.5

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