The visibility standard index (VSI) is a measure of Denver air pollution that is reported each dayto theDenver Post. The index ranges from 0 (excellent air quality) to 200 (very bad air quality).During the winter months, when air pollution is higher, the index has a mean of about 90 (rated as fair) with a standard deviation of approximately 30. Suppose that for 15 days (during the winter), the following VSI measures were recorded each day. Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 VSI 80 115 100 90 15 10 53 75 80 110 165 160 120 140 195 a) Make a control chart for the VSI, and plot the above data on the control chart. Besure to include the horizontal lines on the control chart    b) identify all out-of-control signals (above or below the mean) that you find in the control chart by type (Type I, II, or III)

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A: Solution: The mean of Y is

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A:

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A:

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A:

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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.