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W3600_HW2

W3600_HW2 - SIEO 3600(Non-IEOR Majors Introduction to...

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SIEO 3600 (Non-IEOR Majors) Assignment #2 Introduction to Probability and Statistics 26th January 2010 Assignment #2 °due February 2nd, 2010 1. Use the data provided in the table below to do the following tasks (a) Draw a scatterplot of salaries in private °rms and in government; calculate their correl- ation coe¢ cient. (b) Draw a scatterplot of salaries in government and in universities; calculate their correla- tion coe¢ cient. Is there anything strange? (Note: do not include the ±Total²row in the analysis because it is di/erent from other rows.) Median salaries for recent U.S. doctorate recipients (1-3 years after degree), by sector of employment: 1999 Private Four-year Ph.D °eld Total noneducational Government institution Total 48,400 68,000 55,000 43,400 Computer sciences 75,000 82,000 66,000 53,000 Engineering 66,700 70,000 65,000 56,300 Life sciences 35,000 61,000 48,000 42,500 Math sciences 45,000 60,500 55,200 39,500 Social sciences 45,000 53,000 52,400 40,000 Physical sciences 52,000 64,000 58,000 39,400 Source: National Science Foundation Division of Science Resources Statistics (NSD/SRS). Survey of Doctorate Recipients, 1999.

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