miles or hours flown. This is why we chose revenue passenger miles and available ton miles. After calculation we found that the R2 of revenue passenger miles is .1764, and the R2 of available ton miles is .5577. We used scatter plots to show this: The available ton miles scatter plot shows a more linear relationship between the two variables. Low point (3132, 1145), high point (4029, 1514) Salary=0.4114xavailable ton miles-143.50 The greatest advantage about this technique is that it only uses
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Solutions to Case Problems Chapter 2 Descriptive Statistics: Tabular and Graphical Presentations Case Problem 1: Pelican Stores 1. There were 70 Promotional customers and 30 Regular customers. Because there are 100 observations in the sample, the frequency and percent frequency distribution are the same. Percent frequency
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edu/manage/uspricehistory/us_price_history.html. The link for the price data is at the bottom of the purple area of the tool. 1. Produce a line plot of the entire data series on one page. Do your best to format the chart in a useful manner. 2. Produce a scatter plot where x is the previous month hog price and y is the current month hog price. Note you will lose one observation when you construct the series for this plot. In other words, generate a second price column which is the original data lagged by one month, e.g. row #1
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highlighted. This presentation will show, by example, how such graphs can easily be created using the SAS/GRAPH® SG procedures. The techniques that will be emphasized in this presentation include: • • • • • • Creation of a dose response plot by overlaying multiple plots in one graph Construction of a hematology panel using treatment regimen and visit numbers as the classification variables Presentation of a matrix of liver function tests (LFTs) for at-risk patients Aggregation of data into on-the-fly
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Beers, Toni Beatty, Adrianne Cheeks 1. In comparison to Figure 8-1, is there another graph that better illustrates the relationship between the number of registered boats and the number of manatee deaths from boats? Yes, a scatterplot (or scatter diagram) is a graph in which the paired (x, y) sample data are plotted with a horizontal x-axis and a vertical y-axis. Each individual (x, y) pair is plotted as a single point. The scatterplot does a much better job of visually depicting the association
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Initially the managers believed that the total daily travel time would be closely related to the number of miles traveled in making the daily deliveries. A simple random sample of 10 driving assignments is provided in Table 1. Use Excel to make a scatter diagram of these deliveries (to verify that a linear relationship does exist) and develop a regression equation expressing this relationship. |Table 1 | | |
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difference between a scatter plot and a line graph is that scatter plots and line graphs have similarities in that they both use an X-Y axis. But a line graph has a line or curve to describe a formula like Y=2X+5, a Scatter plot is a collection of X-Y coordinates that have no real formula due to real life uncertainties (heinsberg), but, once plotted, can provide a clue to a single formula. On a line graph, the points are connected by a line. Hence the name “line graph”. A scatter plot can be used as an
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Session 13 - Homework Problems Miguel Faundez Chapter 13 13.4 Answers a) The scatter plot shows a positive linear relationship. b) For each increase in shelf space of an additional foot, weekly sales are estimated to increase by $7.40. c) Y=145+7.4X=145+7.4(8)=204.2, or $204.20. 13.5 Answers a) From the scatter diagram, we can see that there exists positive relation between reported and audited magazine. b) The slope, B1=26.724 implies that for a unit increment in number of
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assignments is provided in Table 1. Use Excel to make a scatter diagram of these deliveries (to verify that a linear relationship does exist) and develop a regression equation expressing this relationship. Table 1 Driving Assignment X1=Miles Traveled Y=Travel Time (hrs.) 1 100 9.3 2 50 4.8 3 100 8.9 4 100 6.5 5 50 4.2 6 80 6.2 7 75 7.4 8 65 6.0 9 90 7.6 10 90 6.1 Excel Instructions for Drawing a Scatter Plot 1. Enter the above information in the Excel spreadsheet
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Business Statistics Topic: Correlation and Regression Recommended Readings: Lind D.A., Marchal W.G., and Wathen S.A. (2012), Statistical Techniques in Business and Economics, 15th International Ed., McGraw Hill [Chapter 13] Earlier edts are also suitable. Waters, D., (2008) Quantitative Methods for Business,4th Ed., Financial Times, Prentice Hall [Chapter 9] When we look at interval or ratio scale variables there is often a relationship, eg: price and quantity demanded; time spent
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