Adrug company tests a new drug by giving some sick people the medicine and by giving other sick people a sugar pill (shaped to look like the medicine). if a sick person taking the sugar pill gets better, that is an example of:

1.the placebo effect
2.the margin of error
3.a confounding factor
4.a bias

This is an example of:

Placebo Effect.

Placebo Effect--

The placebo effect is a beneficial health outcome or a fascinating phenomenon that occurs  resulting from a person's anticipation that an intervention—pill, procedure, or injection, for example—will help them.

In this phenomenon it was observed that a fake pill help in improving the health condition of a patient as compared to a true drug or medicine.

Hence, from the information given in the question we see that the following condition is an example of:

Placebo Effect.

f

step-by-step explanation:

f

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40