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WA9 - Robert E Goode Thomas Edison State College...

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Robert E Goode Thomas Edison State College STA-201-OL010 Mentor: Steve Stutz Date: 11/04/11 Writing Assignment #9 Exercises Set 14.1 (14.2, 14.4, 14.6, 14.8, 14.10, 14.14, 14.16) Exercise 14.2 Straight line Exercise 14.4 a. False. It slopes upward only if the slope is > 0 b. True. Exercise 14.6 a. y = 30 + 55x b. b 0 =30, b 1 =55 c. Tme (x) Cost (y) .5 57.5 1 85 2.25 153.75
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d. Graph: Cost Exercise 14.8 a. b o =64, b 1 =32 b. Tme (x) Cost (y) 1 32 2 0 3 -32 4 -64
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c. Graph: Velocity d. ball will travel at about 18 ft/sec after 1.5 sec. y = 64-32.1.5 = 16 14.10 a. b 0 = 30 and b 1 = 55 b. The y-intercept b 0 = 30 gives the y-value at which the straight line y = 30+55x intersects the y-axis. The slope b 1 = 55 indicates that the y-value increases by 55 units for every increase of x of one unit. c. The y-intercept b 0 = 30 is the service charge incurred without any work done. The slope b 1 = 55 represents the fact that the cost per hour is $55; it is the amount the total cost increases for each additional hour worked. 14.14 a. B 0 =-1 and b 1 =2 b. Slopes upward. c. Graph: Y 14.16
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a. B 0 = -8 and b 1 = -4 b. Slopes downward c. Graph Y Exercises Set 14.2 14.34 a. It helps us visualize any apparent relationship between two quantitative variables of a population. b. The data points must appear to cluster about a line. 14.40 a. b.
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c. According to the least squares criterion, Line B fits the set of data points better than Line A. This is because the sum of squared errors is smaller for Line B than for Line A.
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