Warm-up 3:2:1 Write down three things you know about graphing! Write down 2 things you want to know about graphing. Write down 1 question you want me to answer.
Analyzing Data with a Graph
Pie Graph Best for data that is part of a whole Good to see proportion of each part
Pie Graph Instruction for drawing Divide circle into sections based on the percentage of the whole
Bar Graph Best for comparing individual items or events Allows you to see how large or small the differences in individual events are
Line Graph Best for continuous changes Allows you to see the change (ex: in speed, temperature)
Line Graph X-axis: independent variable y-axis: dependent variable
Line Graph Example: Temperature in New York City over a period of six days
Which axis? A population of sea monkeys is counted for three weeks. X-axis = weeks Y-axis = population of sea monkeys Plant height is measured over a period of 8 weeks. Y-axis = plant height
Which axis? The amount of oxygen consumed per minute is measured while exercising. X-axis = time (minutes) Y-axis = amount of oxygen The amount of food (in grams), eaten by a person each day is monitored. X-axis = day Y-axis = amount of food in grams
Creating a Line Graph
Data For eight weeks you monitor the growth of your house plant. You record the following information: Time (weeks) Height (cm) 4 1 6 2 9 3 12 16 5 19 21 7 23 8 25
8 Week Observation of House Plant Growth Step 1 Title the Graph
Step 2 Label Axis with UNITS 8 Week Observation of House Plant Growth Height (cm) Time (weeks)
Step 3 Axis Scale: Spread It Out 8 Week Observation of House Plant Growth Step 3 Axis Scale: Spread It Out 24 18 Height (cm) 12 6 2 4 6 8 Time (weeks)
Step 4 Plot the Data Points 8 Week Observation of House Plant Growth Step 4 Plot the Data Points ● 24 ● ● ● 18 ● Height (cm) 12 ● ● 6 ● ● 2 4 6 8 Time (weeks)
Step 5 Put in Best Fit Line 8 Week Observation of House Plant Growth ● 24 ● ● ● 18 ● Height (cm) 12 ● ● 6 ● ● 2 4 6 8 Time (weeks)
NOW YOU HAVE A GRAPH . . . IT IS TIME TO TRY IT ON YOUR OWN!!