Blog

For each of the two scenarios below, please identify 1) what…

For each of the two scenarios below, please identify 1) what type of sample was collected (convenience, cluster, purposive, simple random, or stratified) and 2) note whether it was a probability or non-probability sample. 1.  A university researcher is interested in studying newly admitted community college transfer students. She begins by dividing the students into two subpopulations: US citizens, and international students. The researcher then randomly samples from each separate subpopulation to ensure that the final combined sample represents the same percentage of US citizens and international students seen in the general community college transfer population.   2.   A 4th grade teacher wants to explore  a newly implemented learning activity for helping classroom students better understand math concepts.  The teacher administers a pre- and post-test to students in her own class and to the class of a colleague that also teachers fourth grade at the school.       

For the scenario below, determine which which one of the gro…

For the scenario below, determine which which one of the group threats to internal validity (selection or regression to the mean) is of most concern and provide one way to control for the threat.   During the fall semester a study was conducted to determine if differences in performance and attitude exist for students enrolled in an on-line course in college level mathematics and a traditional on-campus delivery of the same college level mathematics course. Student self-selected the course that they were enrolled in and students were enrolled in one and only one of the courses.