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A simple random sample of 12 e-readers of a certain type had the following minutes of...

A simple random sample of 12 e-readers of a certain type had the following minutes of battery life.

287, 311, 262, 392, 313, 299, 257, 316, 286, 302, 324, 291

Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 56. What is the upper bound of the 95% confidence interval for the battery life for all e-readers of this type?

Round your answer to one decimal places (for example: 319.4). Write only a number as your answer. Do not write any units.

Math   Statistics-And-Probability   
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Answer #1

Note: The Z value for 95% confidence interval is 1.960 .

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