TABLE 13-11 A Weight-Loss Clinic Wants to Use Regression Analysis to Build

question 165

Multiple Choice

TABLE 13-11
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)
X1 = Length of time in weight-loss program (in months)
X2 = 1 if morning session, 0 if not
X3 = 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 = β0 + β1X1 + β2X2 + β3X3 + β4X1X2 + β5X1X3 + ε
Partial output from Microsoft Excel follows:

-Referring to Table 13-11, 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

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Definitions:

Inhelder

Swiss developmental psychologist best known for her work on the cognitive development of children, often in collaboration with Jean Piaget.

Reason

The mental capacity to form judgments or conclusions based on logic and knowledge.

Combination-of-liquids task

A cognitive task used to assess a child's understanding of conservation; involves mixing liquids to see if a child understands that volume remains constant despite changes in appearance.