Question

What is the probability that a person saw results, given they received the Power Pill? What is the probability that a person saw results, given they received a placebo? Explain in terms of the study.

Answer 1

how many people received the power pill?; of those, how many saw results?

how many people received the placebo?; of those, how many saw results?

Answer 2

well I took a better look at the graph, and I saw that a total of 13 people took the pill

Answer 3

6+7+4+3

each column has 10 in it and the first 2 columns recevied the pill

20 received it: 6+7 saw results, the top row is saw results right?

Answer 4

That is correct

Answer 5

then whats our probability; that given they received the pill, they saw results?

Answer 6

I know that 13 people took the pill and saw results. I am confused as to whether I put that number over the total of people in the study or just the total of people that saw results.

Answer 7

13/40 or 13/22?

Answer 8

the key word is: given

our total population of concern is refined to ONLY those who recieved the pill.

GIVEN they received the pill, whats the probability of picking someone who saw results?

this is a very important concept to grasp.

we are GIVEN a subset of the overall data

use ONLY that subset in determining the results desired.

Answer 9

maybe i'm not following you. I see that only group a and b actually received the pill

Answer 10

me too im trying to help you over something that is really quite simple that your having a block with

Answer 11

yes that's what I pointed out

Answer 12

13/22 is not a viable result, unless you mistyped it?

we have 13 favorable outcomes out of 20 possible results

Answer 13

ok is see that you mean the total of group a and b, i thought it had to be for the total amount of people that saw results

Answer 14

tell me your results on the placebo one

Answer 15

the total number of people that saw results given the placebo would be 9/20 if that's what you mean

Answer 16

good

now if the question was asked:

how many "given they saw results" took the placebo

22 total saw results; 9 took placebo ... this is a situation in which wed use that 22

Answer 17

... that might be better worded as

how many "given they saw results" took the placebo

22 saw results, 9 of those who saw results took the placebo: 9/22

Answer 18

is that the answer?

Answer 19

we already covered the answer, that was just some added practice.

Answer 20

P(saw results, given they got the drug) = 13/20

P(saw results, given they got the fake) = 9/20

Answer 21

so if those are the answers then it would be 65% for the first one and 45% for the second one?

Answer 22

the term: probability , has a very specific meaning.

it is a value between 0 and 1

13/20 is a probability

if it asks for "the percentage" then we convert it as needed. it asks for the probability.

Answer 23

65/100 is a probability

65% is a percentage of a population.

Answer 24

I see so I would leave it as it is then?

Answer 25

in my experience, yes.

Answer 26

Alright well thank you very much, now that i know how to do this I can do other problems similar in my project

Answer 27

good luck :)

Answer 28

was there a formula that you used or did you just know that?