exam1-421-summer-08 - STT 421 Summer 2008 Exam #1...

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Unformatted text preview: STT 421 Summer 2008 Exam #1 Instructor: Erkan Nane Name: PID: Instructions Read each problem carefully. Show all your work. Credit will only be awarded if your work is included. Problem Max Points 1 15 2 15 3 5 4 10 5 15 6 15 7 10 8 12 9 10 10 13 total 120 1 Problem 1. The following relative frequency histogram has been con- structed on the basis of 100 entries. (5pts) a. Find the missing height over (10,15) and restore the frequencey table for it (make sure that the total number of entries in your ferquency table is 100). (5pts) b. Does the form of the histogram allow to compare the median and the mean? Which one is greater? Explain the criterion. (5pts) c. What proportion of the observations fall above 5? 2 Problem 2. Given the data set 3, 2, 6, 11, 13, 14, 15, 17, 18, 5, 2, 0, 10, 2, 3, 8, 2, 5, 4. (5pts) a. Make a stemplot of this data. (5pts) b. Calculate Q 1 ,M,Q 3 ( first and third quartiles and median). (5pts) c. Calculate the interquartile range (IQR) and point out outliers, if any (use the 1 . 5 IQR criterion). Make a Boxplot of the data....
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exam1-421-summer-08 - STT 421 Summer 2008 Exam #1...

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