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Fall 2011 STA 309 Chapter 1 Homework

Fall 2011 STA 309 Chapter 1 Homework - STA 309 Written...

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STA 309 Written Homework 1 Fall 2011--Dr. Gemberling Due: Wednesday, Sept. 7 (in class)—Please make sure you show all of your work, write neatly and circle your answers. 1. According to an article in the Wall Street Journal, many cyclical stocks such as International Paper did not experience significant growth during a time in which other stocks were experiencing a bull market. The annual rates of return for International Paper during this 8-year period are given below in %. -18, +9, +22, +5, +14, +6, -3, -2 Find the mean, variance and standard deviation of the above rates of return. 2. Unisys.com is one of the most frequented business-to-business web sites. According to an article in the Wall Street Journal, business partners accessing this site spend an average of 60.2 minutes, possibly the longest average time per visit of any business-to- business site. Assume that the length of a visit on this site is normally distributed with a mean of 60.2 minutes and a standard deviation of 10 minutes.
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