The shape of the distribution of the time required to get an oil change at a 10​-minute ​oil-change facility is unknown.​ However, records indicate that the mean time is 11.3 minutes​, and the standard deviation is 3.4 minutes. Complete parts ​(a) through ​(c). ​(a) To compute probabilities regarding the sample mean using the normal��� model, what size sample would be​ required?     A. Any sample size could be used.   B. The sample size needs to be less than or equal to 30.   C. The sample size needs to be greater than or equal to 30.   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=40 oil changes results in a sample mean time less than 10 ​minutes?   The probability is approximately nothing. ​(Round to four decimal places as​ needed.)

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.