Question

Confounding_

A.occurs in an experiment when you are not able to distinguish among the effects of different factors

B.is used when subjects are assigned to different groups through a process of random selection.

C.is the repetition of an experiment on one or more subject

D.s a technique in which a subject doesn't know whether he or she is receiving a treatment or a placebo.

I answered C

Answer 1

?

Answer 2

would the answer be C?

Answer 3

ok tell me why u think C

Answer 4

i think its C because it makes sense and D doesn't make any sense at all

Answer 5

oh wait it must be A

Answer 6

why do u think that

Answer 7

cause it fits in with the definition of confounding

Answer 8

is A correct?

Answer 9

ok hold on

Answer 10

Confounding
Confounding occurs when the experimental controls do not allow the experimenter to reasonably eliminate plausible alternative explanations for an observed relationship between independent and dependent variables.

Consider this example. A drug manufacturer tests a new cold medicine with 200 volunteer subjects - 100 men and 100 women. The men receive the drug, and the women do not. At the end of the test period, the men report fewer colds.

This experiment implements no controls at all! As a result, many variables are confounded, and it is impossible to say whether the drug was effective. For example, gender is confounded with drug use. Perhaps, men are less vulnerable to the particular cold virus circulating during the experiment, and the new medicine had no effect at all. Or perhaps the men experienced a placebo effect.

This experiment could be strengthened with a few controls. Women and men could be randomly assigned to treatments. One treatment could receive a placebo, with blinding. Then, if the treatment group (i.e., the group getting the medicine) had sufficiently fewer colds than the control group, it would be reasonable to conclude that the medicine was effective in preventing colds.

Answer 11

ok now tell me if a is correct

Answer 12

yes that would be correct so it would be A

Answer 13

wait no

Answer 14

D

Answer 15

D is correct

Answer 16

right?

Answer 17

hello? is D correct then?

Answer 18

did u get that

Answer 19

yes so D is right???

Answer 20

yes