he 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 16.7 minutes, and the standard deviation is 4.6 minutes. Complete parts (a) through (c) below. (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? Choose the required sample size below. A. The sample size needs to be less than 30. B. Any sample size could be used. C. The sample size needs to be greater than 30. Your answer is correct. D. The normal model cannot be used if the shape of the distribution is unknown. (b) What is the probability that a random sample of n=45 oil changes results in a sample mean time less than 15 minutes? The probability is approximately 0.00660.0066. (Round to four decimal places as needed.) (c) Suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday, the oil-change facility will perform 45 oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, at what mean oil-change time would there be a 10% chance of being at or below? This will be the goal established by the manager. (How to do it with a TI 84 Plus CE)

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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

16.7 minutes,

and the standard deviation is

4.6 minutes.

Complete parts (a) through (c) below.

(a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required?

Choose the required sample size below.

The sample size needs to be less than 30.

Any sample size could be used.

The sample size needs to be greater than 30.

Your answer is correct.

The normal model cannot be used if the shape of the distribution is unknown.

(b) What is the probability that a random sample of

n=45

oil changes results in a sample mean time less than

minutes?

The probability is approximately

0.00660.0066.

(Round to four decimal places as needed.)

(c) Suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday, the oil-change facility will perform

oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, at what mean oil-change time would there be a 10% chance of being at or below? This will be the goal established by the manager.

(How to do it with a TI 84 Plus CE)

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