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STAT 1124 Quiz 1 Model Answers

# STAT 1124 Quiz 1 Model Answers - STAT 1124 Section 2 Quiz 1...

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STAT 1124 Section 2 Quiz 1 January 20, 2009 You have 20 minutes to complete the following 1. A research study was developed to compare the effect of a new nutritional supplement on weight loss. 40 people were recruited for the study and randomly assigned to two groups with 20 people in each group. For a period of three months, the two groups are subjected to the following: i. Group A: exercise 3 times a week for 30 minutes ii. Group B: exercise 3 times a week for 30 minutes plus taking the nutritional supplement every day Weights of the participants were obtained before and after the study period. a) Identify the response variable: (1) weight loss = weight before – weight after b) Identify the explanatory variable and its values: (1) The explanatory variable is taking the nutritional supplement. It has two values: taking the supplement and not taking the supplement c) Give two possible lurking variables: (1) Age, gender, ethnicity, and other social economic variables d) What kind of design is this experiment? (1)

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