The contingency table below lists the data count from a random
sample of 100 subjects. The types of communication and age groups
are the two variables depicted in the study. Compute the column and
row totals and then find the requested probabilities using the
information in the table. Round probabilities to three
places.
|
Age |
||||
|
Types of Communication |
? 20 |
21 – 39 |
40 + |
Totals |
|
Cell Phone |
21 |
10 |
13 |
|
|
|
6 |
8 |
7 |
|
|
Social Media |
11 |
14 |
10 |
|
|
Totals |
100 |
|||
|
P(40+) = |
P (Cell Phone) = |
|
P(Email AND ? 20) = |
P(Social Media| ? 20) = |
|
P(Email C)** = |
P (40+ | Social Media) |
|
P(21 -39 AND Cell Phone) = |
P(Cell Phone| ? 20 ) = |
|
P(? 20 | Email)= |
P(Email | 21 -39) = |
|
P(Cell Phone OR Social Media) = |
P(Social Media OR 40+) = |
|
**Note: P(Email C) =
m) Are the following two events independent? |
|
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