Elementary Statistics
12th Edition
ISBN: 9780321836960
Author: Mario F. Triola
Publisher: PEARSON
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Chapter 10.5, Problem 17BB
To determine
To test: The claim that
To explain: The results imply about the regression equation.
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How the most common use of a one-sided t-test is to determine whether a regression coefficient ?
Observations are taken on sales of a certain mountain bike in 30 sporting goods stores. The regression model was Y = total sales
(thousands of dollars). X₁ = display floor space (square meters), X₂= competitors' advertising expenditures (thousands of dollars), X₁ =
advertised price (dollars per unit).
Predictor
Intercept
FloorSpace
CompetingAds
Price
Coefficient
1,243.88
13.74
-6.848
-0.1461
(a) Write the fitted regression equation. (Round your coefficient CompetingAds to 3 decimal places, coefficient Price to 4 decimal
places, and other values to 2 decimal places. Negative values should be indicated by a minus sign.)
*FloorSpace+
*CompetingAds+
(b-1) The coefficient of FloorSpace says that each additional square foot of floor space
O takes away 13.74 from sales (in thousands of dollars)
O adds about 13.74 to sales (in thousands of dollars)
adds about 6.848 to sales (in thousands of dollars)
takes away 01496 from sales (in thousands of dollars)
(b-2) The coefficient of CompetingAds…
A researcher is investigating possible explanations for deaths in traffic accidents. He examined data from 2000 for each of the 52 cities randomly selected in the US. As part of his study, he ran the following simple linear regression model: Ho:B1=0 versus H1:B1 not equal =/ to 0. Based on the results from table in photo, determine the value of correlation Rsquared of this simple linear regression model. Help me understand how you solved for R-squared.
Chapter 10 Solutions
Elementary Statistics
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