C. used to produce other goods and services
<span>Set a budget and save early and save often! Try not spending too much money on invaluable objects.</span>
Answer:
.d) Gibson and Walk demonstrated that most babies displayed depth perception by they time they could crawl.
Explanation:
The study by Gibson and Walk titled The Visual Cliff concluded that most children can discriminate depth as soon as they can crawl and display depth perception. Even though their mums called across from the other side of the cliff, of the 36 infants used in the study, only 3 walked across the cliff to meet their mum.
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.
