Data Analysis

Qualitative Data• Data that when collected is

descriptive in nature:• Eye colour, Hair colour

Quantitative Data• Data that when collected is

numerical:• Continuous data is

measured on a scale from zero to infinity with no breaks

• Discrete data is collected a count

Analysis of data

Qualitative data• Frequency• Frequency %

Quantitative data• Stem and Leaf chart• Frequency Chart

Data Analysis

Qualitative Data• Frequency

Quantitative Data • Measure of central

tendency• Mean• Median

Data Analysis

• Frequency chart as a bar chart

• Frequency chart as a pie chart

• mode

Quantitative Data• Measure of spread• Range• IQR (interquartile range)• mode

Data Analysis

Qualitative• Bar Chart• Pie Chart

Quantitative Data• Charts ad Graphs• Box and Whiskers• Histogram• X-Y Scatter graph• Line graph

Box and Whisker plot

Height (cm) Arm Span (cm)140

145

150

155

160

165

170

175

180

Box and Whiskers Plot

(cm

)

Histogram

140 - 149 150 - 159 160 - 169 170 - 179 180 - 1890

2

4

6

8

10

12

Frequency Graph (Height)

Height (cm)

Frqu

ency

X-Y Scatter graph

145 150 155 160 165 170 175 180 185 190145

150

155

160

165

170

175

180

185

190

f(x) = 0.888727694762803 x + 15.7453576091687R² = 0.619705574106618

Relationshipe Between Height and Arm Span for Individuals

Arm Span (cm)

Heig

ht (c

m)

Bar Chart

_x0004_Blue _x0005_Brown _x0005_Hazel _x0005_Green0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

40.00

Frequency of Eye Colour in Population

Eye Color

Frqu

ency

(%)

Pie Chart

18%

36%18%

29%

Frequency of Eye Colour in Population

BlueBrownGreenHazel

Definitions

• Mean: The average (total of measurements• divided by number of samples)• Median: middle number in an ordered set• Mode: most common number• Range: High value to value• LQ: start of bottom 25% of data points• UQ: start of top 25% of data points• IQR: difference between UQ and LQ