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Question

In a multiple regression model, the partial regression coefficient of an independent variable represents the increase in the y variable when that independent variable is increased by one unit if the values of all other independent variables are held constant.

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Q: Medical Wonders is a specialized interior design company focused on healing artwork. The CEO, Kathleen Kelledy claims that artwork has healing effects for patients staying in a hospital, as measured by reduced length of stay. Her current client is a children's cancer hospital. Kathleen is interested in determining the effect of three different pieces of healing artwork on children. She chooses three paintings (a horse photo, a bright abstract, and a muted beach scene) and randomly assigns six hospital rooms to each painting. In Kathleen's experimental design "reduced length of stay" is _______. a) the dependent variable b) a concomitant variable c) a treatment variable d) a blocking variable e) a constant
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Q: Annie Mikhail, market analyst for a national company specializing in historic city tours, is analyzing the relationship between the sales revenue from historic city tours and the size of the city. She gathers data from six cities in which the tours are offered. Annie's dependent variable is annual sales revenues and her independent variable is the city population. Regression analysis of the data yielded the following tables. Coefficients Standard Error t Statistic p-value Intercept -0.14156 0.292143 -0.48455 0.653331 x 0.105195 0.013231 7.950352 0.001356 Source df SS MS F Se = 0.237 Regression 1 3.550325 3.550325 63.20809 r2 = 0.940483 Residual 4 0.224675 0.056169 Total 5 3.775 Annie's sample size is __________. a) 2 b) 4 c) 6 d) 8 e) 10
Q: Annie Mikhail, market analyst for a national company specializing in historic city tours, is analyzing the relationship between the sales revenue from historic city tours and the size of the city. She gathers data from six cities in which the tours are offered. Annie's dependent variable is annual sales revenues and her independent variable is the city population. Regression analysis of the data yielded the following tables. Coefficients Standard Error t Statistic p-value Intercept -0.14156 0.292143 -0.48455 0.653331 x 0.105195 0.013231 7.950352 0.001356 Source df SS MS F Se = 0.237 Regression 1 3.550325 3.550325 63.20809 r2 = 0.940483 Residual 4 0.224675 0.056169 Total 5 3.775 Annie's regression model can be written as: __________. a) y = 7.950352 - 0.48455x b) y = -0.48455 + 7.950352x c) y = -0.14156 + 0.105195x d) y = 0.105195 - 0.14156x e) y = 0.105195 + 0.14156x
Q: A manager wants to predict the cost (y) of travel for salespeople based on the number of days (x) spent on each sales trip. The following model has been developed: y = $400 + 120x. If a trip took 4 days, the predicted cost of the trip is _____________. a) 480 b) 880 c) 524 d) 2080 e) 1080
Q: In the regression equation, y=2.164+1.3657x n=6, the mean of x is 8.667, Sxx=89.333 and Se=3.44. A 95% prediction interval for y when x=8 is _________ a) (9.13, 17.05) b) (2.75, 23.43) c) (10.31, 15.86) d) (3.56, 22.62) e) (12.09, 14.09)
Q: A researcher has developed a regression model from fourteen pairs of data points. He wants to test if the slope is significantly different from zero. He uses a two"‘ tailed test and a = 0.01. The critical table t value is _______. a) 2.650 b) 3.012 c) 3.055 d) 2.718 e) 2.168
Q: In a regression analysis if SST = 200 and SSR = 200, r 2 = _________. a) 0.25 b) 0.75 c) 0.00 d) 1.00 e) -1.00
Q: The proportion of variability of the dependent variable accounted for or explained by the independent variable is called the _______. a) sum of squares error b) coefficient of correlation c) coefficient of determination d) covariance e) regression sum of squares
Q: The numerical value of the coefficient of determination must be _______. a) between -1 and +1 b) between -1 and 0 c) between 0 and 1 d) equal to SSE/(n-2) e) between -100 and +100
Q: A standard deviation of the error of the regression model is called the _______. a) coefficient of determination b) sum of squares of error c) standard error of the estimate d) R-squared e) coefficient of correlation
Q: The following residuals plot indicates _______________. a) a nonlinear relation b) a nonconstant error variance c) the simple regression assumptions are met d) the sample is biased e) the sample is random

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