TABLE 17-6
A weight-loss clinic wants to use regression analysis to build a model for weight loss of a client (measured in pounds).Two variables thought to affect weight loss are client's length of time on the weight-loss program and time of session.These variables are described below:
Y = Weight loss (in pounds)
X 1 = Length of time in weight-loss program (in months)
X 2 = 1 if morning session,0 if not
X 3 = 1 if afternoon session,0 if not (Base level = evening session)
Data for 12 clients on a weight-loss program at the clinic were collected and used to fit the interaction model:
Y = β 0 + β 1 X 1 + β 2 X 2 + β 3 X 3 + β 4 X 1 X 2 + β 5 X 1 X 3 + ε
Partial output from Microsoft Excel follows:
Regression Statistics ANOVA
F = 5.41118 Significance F = 0.040201
-Referring to Table 17-6,what is the experimental unit for this analysis?
A)a clinic
B)a client on a weight-loss program
C)a month
D)a morning,afternoon,or evening session

Question

TABLE 17-6
A weight-loss clinic wants to use regression analysis to build a model for weight loss of a client (measured in pounds).Two variables thought to affect weight loss are client's length of time on the weight-loss program and time of session.These variables are described below:
Y = Weight loss (in pounds)
X 1 = Length of time in weight-loss program (in months)
X 2 = 1 if morning session,0 if not
X 3 = 1 if afternoon session,0 if not (Base level = evening session)
Data for 12 clients on a weight-loss program at the clinic were collected and used to fit the interaction model:
Y = β 0 + β 1 X 1 + β 2 X 2 + β 3 X 3 + β 4 X 1 X 2 + β 5 X 1 X 3 + ε
Partial output from Microsoft Excel follows:
Regression Statistics  ANOVA
F = 5.41118 Significance F = 0.040201 
-Referring to Table 17-6,what is the experimental unit for this analysis?
A)a clinic 
B)a client on a weight-loss program 
C)a month 
D)a morning,afternoon,or evening session

Quizplus · Accepted Answer

The experimental unit in this analysis is the client on a weight-loss program, as the data is collected for individual clients and weight loss is measured for each client. The length of time in the weight-loss program and the time of session are predictor variables for weight loss, and the interaction term between these two variables is also included in the model.

TABLE 17-6 A Weight-Loss Clinic Wants to Use Regression Analysis to Build