Chapter 3 Data Analysis

1
Chapter 3 Data Analysis
2
3-1(B, D) Mean, Median Mode

• Given the data 1, 4, 4, 5, 6, 8, 8, 8, 10
• The Measures of Central Tendency are
• The Mean is 6 (1 4 4 5 6 8 8 8
  10 54)
• 54 9 6
• most useful when data has no outliers
• Median is 6 ( in the middle of the Organized
  data)
• most useful when data has outliers or no big
  gaps in the middle
• Mode is 8 ( that appears most often)
• most useful when data has many identical
  numbers.
• Range is 9 (the difference between the greatest
  least s)

3
3-2 (B) Frequency Tables

• Frequency Tables use a Scale, Tally, and
  Frequency to display data that mostly fall within
  given intervals.
• Scale Tally Frequency
• 0-4 llll l
  6

Numeric display of tally marks
Record data, usually in intervals
Counters used to record items
4
3-2 (D) Line Plots

• Show NUMERICAL DATA as individual points.
• You are looking for OUTLIERS, GAPS and CLUSTERS.
• x x x
• x x x x x x x
• x x x x x x x x x
• 5 6 7 8 9 10 11 12 13 14 15 16 17
  18

Gap 14-18 Outlier 18 Cluster 5-10