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Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola
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Confidence Interval with known ?. In Exercise, find the

Chapter 7, Problem 38BSC

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QUESTION:

Problem 38BB

Confidence Interval with known σ. In Exercise, find the confidence interval using the known value of σ.

Construct the confidence interval for Exercise assuming that σ is known to be 2.55 chocolate chips.

Exercise

Chocolate Chip Cookies The Chapter Problem for Chapter 3 includes the numbers of chocolate chips in a sample of 40 Chips Ahoy regular cookies. The mean is 23.95 chocolate chips and the standard deviation is 2.55 chocolate chips. Construct a 99% confidence interval estimate of the mean number of chocolate chips in all such cookies. How does the confidence interval not contradict the fact that most of the original values do not fall between the confi­dence interval limits?

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QUESTION:

Problem 38BB

Confidence Interval with known σ. In Exercise, find the confidence interval using the known value of σ.

Construct the confidence interval for Exercise assuming that σ is known to be 2.55 chocolate chips.

Exercise

Chocolate Chip Cookies The Chapter Problem for Chapter 3 includes the numbers of chocolate chips in a sample of 40 Chips Ahoy regular cookies. The mean is 23.95 chocolate chips and the standard deviation is 2.55 chocolate chips. Construct a 99% confidence interval estimate of the mean number of chocolate chips in all such cookies. How does the confidence interval not contradict the fact that most of the original values do not fall between the confi­dence interval limits?

ANSWER:

Answer:

Step 1 of 1

The mean is 23.95 chocolate chips and the standard deviation is 2.55 chocolate chips. The numbers of chocolate chips in a sample of 40 Chips Ahoy regular cookies.

The formula for a confidence interval for one population mean in this case is

                 

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