(a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? A. The normal model cannot be used if the shape of the distribution is unknown. B. Any sample size could be used. C. The sample size needs to be greater than or equal to 30. Your answer is correct. D. The sample size needs to be less than or equal to 30. Part 2 (b) What is the probability that a random sample of n=35 oil changes results in a sample mean time less than 15 minutes? The probability is approximately
(a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? A. The normal model cannot be used if the shape of the distribution is unknown. B. Any sample size could be used. C. The sample size needs to be greater than or equal to 30. Your answer is correct. D. The sample size needs to be less than or equal to 30. Part 2 (b) What is the probability that a random sample of n=35 oil changes results in a sample mean time less than 15 minutes? The probability is approximately
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
The shape of the distribution of the time required to get an oil change at a
15-minute
oil-change facility is unknown. However, records indicate that the mean time is
16.5 minutes,
and the standard deviation is
4.2 minutes.
Complete parts (a) through
(c).
Question content area bottom
Part 1
(a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required?
The normal model cannot be used if the shape of the distribution is unknown.
Any sample size could be used.
The sample size needs to be greater than or equal to 30.
The sample size needs to be less than or equal to 30.
Part 2
(b) What is the probability that a random sample of
n=35
oil changes results in a sample mean time less than
15
minutes?The probability is approximately
enter your response here.
(Round to four decimal places as needed.)
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