Alan is conducting an experiment to determine whether a new medication is effective in reducing coughing. he finds 2,000 volunteers with coughing issues and divides them into two groups. the control group does not receive any medication; the treatment group receives the medication. the patients in the treatment group show reduced signs of coughing. what can alan conclude from this experiment?

We know the following information:

Alan is conducting an experiment to determine whether a new medication is effective in reducing coughing.

Alan finds 2000 volunteers with coughing issues and divides them into two groups.

The control group does not receive any medication; the treatment group receives the medication. The patients in the treatment group show reduced signs of coughing.

Therefore, Alan can conclude that the new medication is effective in reducing coughing.

Alan can say that the medicine given to people most likely worked as the treatment group showed signs of reduced coughing.

a. is correct

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11