. Harrison et al. are conducting a study assessing the ability of depressed versus non-depressed participants to remember negative emotions in a short story about a family whose car breaks down. They plan to ask participants to read the story and then make a list of the emotions expressed in the story. Before beginning the study, they make a list of negative emotions (e. g., sadness and anger) that they will record from the participants’ responses. In this example, negative emotions are the .a. operational definition b. significant variablec. independent variable d. dependent variable

d. dependent variable

Explanation:

In research, we usually work with two variables:

In this example, the researchers are conducting a study assessing the ability of depressed versus non-depressed participants to remember negative emotions in a short story. We can see that they think that depression will have an effect on the negative emotions they will remember. They cannot control the results of this study or the negative emotions the participants will remember. Therefore, since they will measure negative emotions and these are being affected by depression, we can say that negative emotions are the dependent variable.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.