The Dow Jones Industrial Average (DJIA) and the Standard & Poor’s 500 (S&P 500) indexes are used as measures of overall movement in the stock market. The DJIA is based on the price movements of 30 large companies; the S&P 500 is an index composed of 500 stocks. Some say the S&P 500 is a better measure of stock market performance because it is broader based. The closing price for the DJIA and the S&P 500 for 15 weeks, beginning with January 6, 2012, follow (Barron’s website, April 17, 2012). The dataset in Excel file DJIAS&P500.xlsx
Consumers have a wide variety of options when choosing Wi-Fi and Bluetooth speaker systems. However, selecting a speaker system that provides good sound at a reasonable price can be difficult. The following data show the price and overall rating for a sample of 25 portable speaker systems that Consumer Reports tested (Consumer Reports website, January 28, 2014). The overall rating is based upon the sound quality, ease of use, and versatility of the speaker, with higher ratings indicating better overall performance. The dataset in Excel file PortableSpeakers.xlsx
One of the biggest changes in higher education in recent years has been the growth of online universities. The Online Education Database is an independent organization whose mission is to build a comprehensive list of the top accredited online colleges. The following table shows the retention rate (%) and the graduation rate (%) for 29 online colleges (Online Education Database website, January 2009). The dataset in Excel file OnlineEdu.xlsx.
Jensen Tire & Auto is in the process of deciding whether to purchase a maintenance con- tract for its new computer wheel alignment and balancing machine. Managers feel that maintenance expense should be related to usage, and they collected the following information on weekly usage (hours) and annual maintenance expense (in hundreds of dollars). The dataset in Excel file Jensen.xlsx
The regional transit authority for a major metropolitan area wants to determine whether there is any relationship between the age of a bus and the annual maintenance cost. A sample of 10 buses resulted in the following data.
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