Computer Science 1032A/B Lecture Notes - Point Estimation, Standard Deviation

• School: Western University
• Department: Computer Science
• Course: Computer Science 1032A/B
• Professor: Vicki Olds

Document Summary

We are to compare four factories that are producing 600-ml bottles of water. We need to determine which factory is doing the best job. We take a sample of 5 bottles of water from a selected hour for each factory. The actual amount of water poured in the 600-ml bottle is given below: How do you determine which factory is doing the best job of filling the bottles. Range = highest observation - not very useful; ignores bulk of the observations lowest observation. Standard deviation this is the most commonly used measure of spread it is a measure of the variation of the data about its mean (it looks at how far the observations are from their average value) We first calculate what is called the variance, s2, of a set of n-observations x1, x2, , xn s2 = s2 = xi n. The standard deviation is the square root of the variance, (cid:229) s =