Question

Are the events, earn an A and study, independent or dependent? What is the probability of randomly selecting a student who did not earn an A given that the student studied? Express the answer as a fraction in simplest form

Answer 1

@Michele_Laino

Answer 2

if the probability of earning an A is the same for all given event that A occurs in, then the probability of A is not dependant on any particular event.

Answer 3

what is the P(A|study)? what is the P(A|total events) ? are they the same? or does the probability of A changed depending on which event takes place?

Answer 4

is 6 out of 30, proportionate to 7 out of 34?

Answer 5

yes because some students who did study got an A

Answer 6

thats not whats being asked.

Answer 7

the probability of A given then event'study': 6 out of 30 right?

Answer 8

yes correct

Answer 9

the probability of A given the totality of all events: 7 out of 34 right?

Answer 10

yes correct

Answer 11

since the probability of A, depends on the event in which it occurs:
6/30 not= 7/34

then A depends on a particular event. They are not independant.

Answer 12

agreed?

Answer 13

yes i do agree

Answer 14

good, just making sure we are not confusing "mutually exclusive" with "independence"

so, do we know how to calculate what they are asking for now?

Answer 15

yes

Answer 16

it owuld be 6/30 and 7/34

Answer 17

read the question carefully

the probability of NOTA, given that they studied.

A, given study is 6/30 .... 1 - A,given study is NOTA, given study.

Answer 18

this is just a depressing question, it ultimately shows that the majority of students studied and still failed ....

Answer 19

88% of the kids studied, and of them, 80% failed to get an A ....

Answer 20

It reflects negatively on the teacher :)

Answer 21

the teachers i had that graded on a curve used that philosophy. They assumed if the majority of the students did not get a good grade, it was because they had not been tested at their skill level - they had not learned the material.

Answer 22

lol dont you agree though???
Or do you think ppl dont like to stretch their brains and think out of the box?
I really do not think its pure laziness ...

Answer 23

i most likely irritated my science class. I was taking the tests and all the correct answer were darker ink then the others. After about 4 questions i brought it to his attention. He had mistakenly printed out the answer key instead. He had to collect all the tests and randomize the question pool again.

Answer 24

IF they studied, then their performance is caused by something else.

IF they fail to study, its their own fault then

Answer 25

so would the answer be B

Answer 26

Lmaoooo
Dude yea i ok i agree with that

Answer 27

24 out of 30

24/30 does nto simplify to B

Answer 28

6/30 = 1/5
24/30 = 4/5

Answer 29

its 4/5 so its dependent correct??

Answer 30

correct

Answer 31

so the answer is A?

Answer 32

thats the one id go with, but im not grading it