Question 1
A researcher interested in studying how friendship changes with age asks students in first-, third-, fifth-, seventh-, ninth-, and eleventh-grades to complete a questionnaire. What type of research design is this researcher using?
◦ sequential-cohort
◦ longitudinal
◦ cross-sectional
◦ age cohort
Question 2
A researcher investigating the effect of peer tutoring on reading skills studies two groups of children in remedial reading classes. One group receives peer tutoring three times a week for three months, the other group does not. At the end of the three months, the two groups are tested in reading skills. What is the independent variable in this experiment?
◦ peer tutoring versus no tutoring
◦ reading skills level at the beginning of the experiment
◦ reading skills level at the end of the experiment
◦ reading skills test itself
Schematic depiction of the hydrophobic effect
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