The number of defective items produced on an assembly line during an hour is counted for a random sample of 20 hours. The results are as follws: 21 16 10 10 11 9 13 12 11 29 10 14 27 10 11 11 12 19 11 9 Construct a stem-and -leaf plot for this sample. Is it reasonable the sample as coming from an approxiamately normal population? Expalin.

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Q: stem-and-leaf plot

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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.