Collecting Data
A local government wants to gauge public opinion on a proposed tax increase to fund school improvements. They send out a survey via email but receive responses primarily from older homeowners without children in schools. Analyze the scenari...
A researcher collects data on the income and education levels of individuals in a town, but only relies on information shared by volunteers. What is the most significant implication of this non-random approach to data collection?
In an experiment studying the effect of a new drug on blood pressure, what are the experimental units?
An educational researcher wants to survey high school students in a large school district to assess their opinions on a new curriculum. The district contains 20 high schools with vastly different demographics and academic performance levels...
Which of the following is most likely to introduce bias into a survey?
How can non-response bias affect the results of a study?
Why is random assignment important in an experiment?
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A researcher wants to test the effectiveness of a new fertilizer on plant growth. They have access to a greenhouse with varying light and temperature conditions. Design an experiment to test the fertilizer's effectiveness, including control...
A researcher is studying the sleep habits of college students. They randomly select 200 students from a university to survey. In this scenario, what is the sample?
Which of the following study types can establish a cause-and-effect relationship between variables?