Written Assignment 9 - Gabriel A. Godart

Written Assignment 9 - Gabriel A. Godart - Principles of...

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Principles of Statistics 2010-04-STA-201-009OL Written Assignment 9 Gabriel A. Godart Thomas Edison State College. Exercises Set 14.1 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. = = b0 30 and b1 55 c. d. e.
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f. g. Exercise 14.8 a. = = b0 64 and b1 32 b. c. d. e. f. g.
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h. According to the graph, we can estimate that the ball will travel at about 18 ft/sec after 1.5 sec. i. y = 64-32.1.5 = 16 j. Exercise 14.10 a. b0 = 30 and b1 = 55 b. The y-intercept b0 = 30 gives the y-value at which the straight line y = 30+55x intersects the y-axis. The slope b1 = 55 indicates that the y-value increases by 55 units for every increase of x of one unit. c. The y-intercept b0 = 30 is the service charge incurred without any work done. The slope b1 = 55 represents the fact that the cost per hour is $55; it is the amount the total cost increases for each additional hour worked. k. Exercise 14.14 a. b0 = -1 and b1 = 2 b. Slopes upward. l. c. m. n. Exercise 14.16 a. b0 = -8 and b1 = -4 b. Slopes downward c.
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d. e. f. Exercises Set 14.2 g. h. Exercise 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. i. Exercise 14.40 a. j.
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b. k. l. 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. m. Exercise 14.52 a. = - / -( ) / b1 xy xy nx2 x 2 n and = ( - ) b0 1n y b1x b. c. d. Thus = - / - / b1 169993 2705552 98316 2702 9 = 15.8935 and = - . = . b0 195552 15 89270 140 189 e. The regression equation is = . + . y 140 189 15 8935x f.
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g. h. i. j. Price tends to increase as the size increases. k. Custom homes appreciate an estimated $15,893.5 per square feet. l.
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This note was uploaded on 05/10/2011 for the course STA 201 taught by Professor Kohn during the Spring '09 term at Thomas Edison State.

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Written Assignment 9 - Gabriel A. Godart - Principles of...

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