Agroup of researchers is measuring foot traffic in a museum. recently one half of the museum was redone in order to encourage more foot traffic. researchers are counting the number of attendees in this new zone and comparing it to other zones that have not been redone. on the first day that researchers are recording foot traffic, several buses of schoolchildren arrive at the museum unexpectedly for a field trip. after a day of testing, the new zone appears to be getting just as much foot traffic as the other zones. which problem is most likely affecting this quasi-experiment?
history threat
testing threat
maturation threat
selection threat

What restrictions do you think should be placed on studies with animal participants? explain

What was the french and indian war about

“dear sir: it is with great reluctance, i trouble you on a subject, which does not fall within your province; but it is a subject that occasions me more distress, than i have felt, since the commencement of the war; and which loudly demands the most zealous exertions of every person of weight and authority, who is interested in the success of our affairs. i mean the present dreadful situation of the army for want of provisions, and the miserable prospects before us, with respect to futurity. it is more alarming than you will probably conceive, for, to form a just idea, it were necessary to be on the spot. for some days past, there has been little less, than a famine in camp. a part of the army has been a week, without any kind of flesh, and the rest for three or four days. naked and starving as they are, we cannot enough admire the incomparable patience and fidelity of the soldiery, that they have not been ere this excited by their sufferings, to a general mutiny or dispersion. strong symptoms, however, discontent have appeared in particular instances; and nothing but the most acitive efforts every where can long avert so shocking a catastrophe.” what’s the central idea?