Question

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.

Answer #1

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

For further queries, please comment below.

Thank you.

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