Question

Krissy wanted to understand whether grade level had any relationship to students' opinion on extending the school day. She surveyed some students and displayed the results in the table below: Compare P(Grade 11 | opposed) with P(opposed | Grade 11). (1 point)

a.P(Grade 11 | opposed) > P(opposed | Grade 11) b.P(Grade 11 | opposed) < P(opposed | Grade 11) c.P(Grade 11 | opposed) = P(opposed | Grade 11) d.There is not enough information.
I Think it may be D but I'm not sure

Answer 1

A. P(Grade 11 | opposed) > P(opposed | Grade 11)
B. P(Grade 11 | opposed) < P(opposed | Grade 11)
C. P(Grade 11 | opposed) = P(opposed | Grade 11)
D. There is not enough information.

Answer 2

@amistre64

Answer 3

@Hero

Answer 4

@ganeshie8 can anyone help?

Answer 5

@phi

Answer 6

@hartnn

Answer 7

can you figure out
P(Grade 11 | opposed)
?

Answer 8

15/38 ?

Answer 9

P(Grade 11 | opposed) means
Probability of Grade 11 GIVEN opposed
Given opposed means "look only at the column labeled opposed"
add up all the numbers in that column
that goes in the "bottom"
only one entry in the opposed column is labeled Grade 11 (the 15)
that goes in the "top"

Answer 10

you should get
P(Grade 11 | opposed) =15/33

Answer 11

oh so 15/33

Answer 12

now do P(opposed | Grade 11)

that means you are "given" Grade 11, which means,
"only look at the row labeled Grade 11"
add up all the numbers in the Grade 11 row. That goes in the bottom
in the top, put the entry (in the Grade 11 row) that is "opposed". (It is 15)

Answer 13

you should get
P(opposed | Grade 11)=15/38

now you have to figure out which is bigger. Hint: if you divide the same number (the 15) by a bigger number, you get a smaller answer. example: ½ is bigger than ⅓

Answer 14

so it is a right?

Answer 15

@phi

Answer 16

@phi the answer is A right?

Answer 17

15/33 > 15/38

so
P(Grade 11 | opposed) > P(opposed | Grade 11)

yes, choice A

Answer 18

YAY thanks so much :)