graphs new

• Graphs

• Estimation

61

• Accuracy & Precision

• Accuracy = How close is it to real value

• Precision = How close is each

measurement to each other

62

• Mean, Median, Mode

66

- Mean = Average

- Median = Middle

- Mode = Most often

- Graphs vs. Text

68

+ Which is better?

At age 1, Sarah was 75 cm

tall. By the time she turned 2,

Sarah had grown 10 cm. By

age 3, she had grown another

10 cm. At age 4, Sarah was

100 cm tall.

Bar Graphs

• Use

– Compare different items

– To one measured amount

Circle or Pie Graphs

• Use

– Compare different items

– To one whole amount

Line Graphs

• Use

– Compare one variable

– To another variable

Steps

• 1.Draw Axis

2. Label

• x- axis (Manipulated variable)

– What you did?

• y-axis (Responding variable)

– What you measured?

• Add Units!

3. Create Scale

• Start zero to highest number

• Distribute evenly

4. Plot Data

• (x,y)

- Line Graphs

+ Example Experiment – Boiling Water

70

- Line Graph

+ Draw Axis

√ X “What you changed”

√ Y “What was measured”

+ Create Scale

+ Plot Data

+ Draw best fit line

71

- Best Fit Line

+ Follow general trend

+ Include as many points as

possible

+ Have same # of points above

and below

72

- Identify Trends

74