Using Two-Way Tables for Probability
Statistics and Probability · Flashcards · Application
STATISTICS AND PROBABILITY · FLASHCARDS
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QUESTION
Find
P
(
B
∣
A
)
P(B\mid A)
P
(
B
∣
A
)
if the count in
(
A
,
B
)
(A,B)
(
A
,
B
)
is
9
9
9
and the total for
A
A
A
is
36
36
36
.
QUESTION
Decide if
A
A
A
and
B
B
B
are independent when
P
(
A
)
=
0.4
P(A)=0.4
P
(
A
)
=
0.4
,
P
(
B
)
=
0.5
P(B)=0.5
P
(
B
)
=
0.5
,
P
(
A
∩
B
)
=
0.2
P(A\cap B)=0.2
P
(
A
∩
B
)
=
0.2
.
QUESTION
Find
P
(
A
∩
B
)
P(A\cap B)
P
(
A
∩
B
)
if the cell count for
(
A
,
B
)
(A,B)
(
A
,
B
)
is
18
18
18
out of a grand total of
120
120
120
.
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ANSWER
18
120
=
0.15
\frac{18}{120}=0.15
120
18
=
0.15
. Apply joint probability formula: cell count over grand total.
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