Answer:
d. cross-sectional study
Explanation:
In research, a cross-sectional study consists of a gathering of data from a population or a subset of the population we want to investigate at an specific point of time. In other words, the data will give us an idea of what's happening within a group in a particular moment in time.
In this example, the researcher gives 20-year-olds, 40-year-olds, and 60-year-olds a questionnaire. He wants to know if older people are calmer than younger ones. We can see that <u>he wants to know what's happening within this groups (the 20 year-olds, the 40's and the 60's) during this particular time of their life </u>and therefore determine if the 60 year-olds are calmer. Therefore this is an example of cross-sectional study.
Answer:
Ohio state studies
Explanation:
Ohio state studies was a leadership research which was conducted by Ohio State University in 1945. The main aim of the study was to help ascertain different behavior which were observed in people.
The research group labeled task behaviors "initiating structure" and focused less on traits of individuals and more on the what was observed which was what made it to be called a leadership theoretical study.
None of these are correct