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Material Type: Assignment; Class: Regression Analysis; Subject: Business Administration; University: University of Southern Mississippi; Term: Fall 2001;

Typology: Assignments

Pre 2010

1 / 5

Download Solutions Key for Assignment 2 - Regression Analysis | BA 303 and more Assignments Introduction to Business Management in PDF only on Docsity! 1 BA 303 Assignment #2 โ Solution Key Chapter 10 1. ASW - page 409 - Question # 17 ยต1 for 2001 season ยต2 for 1992 season H0: 1 2 0ยต ยตโ โค Ha: 1 2 0ยต ยตโ > b. 1 2x xโ = 60 - 51 = 9 days 9/51(100) = 17.6% increase in number of days. c. ( )1 2 2 2 2 2 1 2 1 2 0 (60 51) 0 2.48 18 15 45 38 x x t s s n n โ โ โ โ = = = ++ 2 22 2 2 2 1 2 1 2 2 2 2 22 2 2 2 1 2 1 1 2 2 18 15 45 38 81 1 18 1 151 1 44 45 37 381 1 s s n n df s s n n n n โ โ โ โ + +โ โ โ โ โ โ โ โ = = = โ โ โ โ โ โ โ โ ++โ โ โ โ โ โ โ โโ โ โ โ โ โ โ โ โ โ Using t table, p-value is between .005 and .01. Actual p-value = .0075 p-valueโค .01, reject H0. There is a greater mean number of days on the disabled list in 2001. d. Management should be concerned. Players on the disabled list have increased 32% and time on the list has increased by 17.6%. Both the increase in inquiries to players and the cost of lost playing time need to be addressed. 2. ASW - page 416 - Question # 27 Using matched samples, the differences are as follows: 4, -2, 8, 8, 5, 6, -4, -2, -3, 0, 11, -5, 5, 9, 5 H0: ยตd โค 0 Ha: ยตd > 0 2 d = 3 and sd = 5.21 t d s n d d = โ = โ = ยต / . / .3 0 5 21 15 2 23 df = n - 1 = 14 Using t table, p-value is between .01 and .025 Actual p-value = .0213 Reject H0. Conclude that the population of readers spends more time, on average, watching television than reading. Chapter 14 3. ASW - page 562 - Question # 1 a. b. There appears to be a linear relationship between x and y. c. Many different straight lines can be drawn to provide a linear approximation of the relationship between x and y; in part d we will determine the equation of a straight line that โbestโ represents the relationship according to the least squares criterion. d. Summations needed to compute the slope and y-intercept are: 215 40 ( )( ) 26 ( ) 10i i i i ix y x x y y x xฮฃ = ฮฃ = ฮฃ โ โ = ฮฃ โ = 1 2 ( )( ) 26 2.6 10( ) i i i x x y yb x x ฮฃ โ โ = = = ฮฃ โ b y b x0 1 8 2 6 3 0 2= โ = โ =( . )( ) . ห 0.2 2.6y x= + e. ห 0.2 2.6(4) 10.6y = + =