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1) A researcher wants to understand whether the level of student-student interaction in online courses leads to better test scores. Students enrolling in an intro psychology course were randomly assigned to one of 10 sections that required either group discussions, group project work, or both group projects and group discussions. Each class had the same cumulative final exam to evaluate student progress, and student scores were reported to the researcher.

a) What is the sample? What is the population?

b) What is the independent variable, and how many levels does it have?

c) What is the dependent variable? What type of scale is used for its measurement?

d) What are some possible confounding variables?

2) Students taking a statistics class were asked how much time they spent on class activities during the week, how many practice problems they completed, and what grade they expected to receive in the class.

a) Classify each variable as qualitative or quantitative, and describe the scale of measurement.

b) If a variable is quantitative, please indicate whether it is continuous or discrete. Explain your reasoning.

Reference no: EM131533470

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