MATH 3070 Study Guide - Midterm Guide: Scatter Plot, Contingency Table, Sample Space
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The national highway system designation act of 199"5 allows states to set their own highway speed limits. Attached to the exam is the data for the maximum speed limits for cars and trucks (in miles per hour) in november 2008. Express the results in a contingency (5 points) table using frequencies and showing all marginal totals. Express the table you derived in part (a) in percentages based on the grand total. (5 points) Draw a bar graph showing the results you derived in part (b). (5 points) A marketing firm wished to determine whether the number of television commercials broadcast was linearly correlated with the sales of its product. The data, obtained from several cities, are shown below: Draw a scatter diagram of this data. (5 points) Complete each of the following (1 point each): Using the numbers you provided in part (b) calculate the correlation coefficient r. (4 points)
