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 3.7 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. The sample size needs to be greater than or equal to 30.   B. The sample size needs to be less than or equal to 30.   C. Any sample size could be used.   D. The normal model cannot be used if the shape of the distribution is unknown.

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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.