Question 8.1.25-T Assigned Media v The shape of the distribution of the time required to get an oil change at a 20-minute oil-change facility is skewed right. However, records indicate that the mean time is 21.2 minutes, and the standard deviation is 4.5 minutes, Com through (c). (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be reguired? A The sample size needs to be greater than or equal to 30. OB. Any sample size could be used. O C. The normal model cannot be used if the shape of the distribution is skewed right. O D. The sample size needs to be less than or equal o 30. (b) What is the probability that a random sample of n 35 oil changes results in a sample mean time less than 20 minutes? The probability is approximately (Round to four decimal places as needed.)

Question 8.1.25-T Assigned Media v The shape of the distribution of the time required to get an oil change at a 20-minute oil-change facility is skewed right. However, records indicate that the mean time is 21.2 minutes, and the standard deviation is 4.5 minutes, Com through (c). (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be reguired? A The sample size needs to be greater than or equal to 30. OB. Any sample size could be used. O C. The normal model cannot be used if the shape of the distribution is skewed right. O D. The sample size needs to be less than or equal o 30. (b) What is the probability that a random sample of n 35 oil changes results in a sample mean time less than 20 minutes? The probability is approximately (Round to four decimal places as needed.)

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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Question4: The times for untrained rats to run a standard maze has a normal distribution where the times are measured in seconds. The researcher hopes to show that training improves the times. A sample of 9 rats were selected and the time to run a standard maze before and after training were measured in seconds and shown below. Does the data support the researcher’s hypothesis? Conduct a hypothesis test at 5% significant level (specify 4 steps).
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Part d and the next picture