Collecting Data
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?
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?
What is a Simple Random Sample (SRS)?
What is the key difference between stratified and cluster sampling?
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. The researcher aims to ensure proportional representation from each school bas...
Which of the following is most likely to introduce bias into a survey?
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How can non-response bias affect the results of a study?
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 scenario and determine the type of bias present and its potential impact.
In an experiment studying the effect of a new drug on blood pressure, what are the experimental units?