Practice exam1

# Practice exam1 - DEPARTMENT OF MATHEMATICS AND STATISTICS...

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DEPARTMENT OF MATHEMATICS AND STATISTICS UNIVERSITY OF MASSACHUSETTS Stat 240 , Joanna Jeneralczuk . EXAM 1 – Practice exam (includes more problems than the actual exam) NAME: Discussion session #: Note: show details of calculations, and justify all answers Question 1 A sample of 11 patients in the intensive care unit of Mt. Sinai Hospital were questioned. The number of heart attacks that they had suffered numbered 2, 3, 4, 7, 7, 10, 2, 5, 6, 5, 2. Compute: a) the sample mean= b) the sample median= c)the sample mode= d) the sample standard deviation= e) the upper and lower quartiles and the IQR (Interquartile range). Q1= Q3= IQR=

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f) Construct a stem and leaf plot and a box-plot. g) Write a brief description of this data set (symmetry, outliers ).
Question 2 In a study used to help improve the working environment, the executives at a large company were cross-classified according to their management styles and the degree of success in motivating their employees.The table below shows the proportions in each category.

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