12-7 ALG

• FREQUENCY: the number of times an event occurs

• 2-WAY TABLE: a chart with two variables (or categories) and how frequently they both happen. The table also includes totals for each response and the number of people surveyed.

• Pg 311, #3 "Reason"

• FIRST ROW (HIKING)

• TOTAL: 165 want to go hiking

• 135 also want to camp (do both)

• 30 don't want to camp (hike only)

• Pg 311, #3 "Reason"

• FIRST COLUMN (CAMPING)

• TOTAL: 180 want to go camping

• 135 also want to hike (do both)

• 45 don't want to hike (camp only)

(outside boxes)

ADD THE TWO INSIDE BOXES

to get the total at the end of a row or column

(inside boxes)

SUBTRACT FROM THE TOTAL

to see how often someone chose the OTHER OPTION in a row/column.

(inside boxes)

SUBTRACT FROM THE TOTAL

to see how often someone chose the OTHER OPTION in a row/column.

Pg 314, #3

THE BOTTOM-RIGHT CORNER IS ALWAYS THE GRAND TOTAL FOR HOW MANY PEOPL WERE SURVEYED.

The Last Row: (68 + 42 = 110) should add up to this amount.

The Last Column: (65 + 45 = 110) should also add up to this amount.