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

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Statistics

Question 12

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

287, 311, 262, 392, 313, 263, 293, 316, 286, 301, 287, 291

Assume that it is reasonable to believe that the population isapproximately normal and the population standard deviation is 62.What is the upper bound of the 95% confidence interval for thebattery 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.

Question 15

A random sample of 13 students were asked how long it took themto complete a certain exam. The mean length of time was 109.5minutes, with a standard deviation of 68.2 minutes. Find the lowerbound of the 90% confidence interval for the true mean length oftime it would take for all students to complete the exam.

Round to one decimal place (for example: 108.1). Write only anumber as your answer. Do not write any units.

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