Collecting Data
Given that a recent survey found owners of electric cars earn above-average incomes, why should this not automatically lead us into assuming electric cars cause increased earnings?
How does clustering differ from stratification in terms of selecting samples?
Which of the following best describes a simple random sample?
What type of bias occurs when certain groups are underrepresented in a survey because they are less likely to be chosen for the sample?
When analyzing if there is any significant linear relationship between SAT scores and first-year college GPA, which statistical tool assesses both strength and direction while also considering outliers?
In designing an experiment on plant growth, where sunlight exposure and water amount are explanatory variables, what type of experimental design reduces variability not accounted for by these two factors?
What is the primary purpose of using random sampling in a statistical study?
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A school district wants to know parent satisfaction about the quality of education. They randomly select two schools from each grade level (elementary, middle, and high) and survey all parents of students in the selected schools. What type ...
If a researcher uses a linear regression model to predict outcomes on new datasets and notices that the residuals are consistently patterned instead of randomly scattered, what is this an indication of?
A survey is conducted to gather data on the study habits of students. The researcher randomly selects three high schools within a population and surveys all students within the selected schools. What type of sampling method is being used?