Identifying Variables and Interpreting Graphs, Study notes of Statistics

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Identifying Variables

and

Interpreting Graphs

KINDS OF VARIABLES

Remember!

Your hypothesis can TELL you what

your variables are!

Ex. If I drink Mountain Dew before

bed, then I will not sleep very much.

IV: Drinking Mountain Dew

DV: the amount of sleep

If I brush my cat more, then there will be

less fur on my furniture

IV: Amount of time brushing the cat

DV: Amount of fur on furniture

GRAPHING SKILLS 1/6/ 8

WHEN TO USE A LINE GRAPH?

Would we use a line graph in the following situations:

• To show how many people like pizza in this class? NO
• To show how many people live in Meridian, Idaho? NO
• To show how much it rained each month this year? YES- because months and years deal with time.

BIRTHDAYS?

• Our birthday does deal with time doesn’t it? (months/years)
• But, our birthday is constant, meaning it never changes.
• A line graph shows change in time, so we would not use it for this type of graph. ◼ Would we use a line graph to show when our birthdays are?

X-AXIS AND Y-AXIS

INTERVALS

• When we are setting up a line graph, we need to decide what intervals we want to use.
• If we are graphing the temperature for a year, do we want to put 365 days on the graph, and 100 different temperatures?
• When we see a horizontal flat line, that means that there was no change during a specific time period.

Title: _____________________ X Axis Independent Variable Y Axis Dependent Variable 1 2 3 4 5 6 13 12 11 10 9 8 7 6 5 4 2 1 Intervals Labeling Labeling Data

BAR GRAPH

Title: _____________________ X Axis Y Axis 1 2 3 5 7 13 12 11 10 9 8 7 6 5 4 2 Intervals^1 Labeling Labeling Data