An educational software company wants to compare the effectiveness of teaching about supply and demand curves between computer animation presentations and textbook presentation. The company tests the economic knowledge of a number of first-year college students, then randomly divides them into two groups. One group uses the animation and the other studies the text. The company retests all the students and compares the increase in economic understanding between the two groups. Is the study described above an experiment? Why or why not?

Yes, this is often an experiment. the corporate assigned students to either the animation or the text, instead of watching post hoc ergo propter hoc data.

Explanation:  

The explanatory variables are the pre-test data and therefore the assignment to a given group. The responding variable is that the post-test data.

i believe the answer is: streets and roads

public property refers to the property that can be used by all legal citizens in a certain country. the public property was created and maintain using the government budget that allocated specifically for it. the budget itself come from the citizen's income tax payment.

750 h and costs $0.60 per bulb.