Box Plots

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Box Plots
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Statistical Measures
Statistics? practice of analyzing a set of data
Measures of Central Tendency numbers that
represent the middle of the data (mean, median,
mode)
Arithmetic average
Median
Middle of the data listed in ascending order
Mode
Most common number (if modes can be more
than One)
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5 Number Summary
Minimum Value (0 Percentile)
Min
Q1
Quartile 1 (25th Percentile)
Med (Q2)
Median (50th Percentile)
Q3
Quartile 3 (75th Percentile)
Max
Maximum or Q4 (100th Percentile)
Med
Max
Min
Q1
Q2
Q3
Q4
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Calculator Commands

• Enter data into STAT?EDIT
• STAT ? CALC ? 1 1-Var STATS
• ? represents mean
• n no. of entries
• med median
• Etc

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Ex. Find the mean, median, and mode of 85, 76,
88, 91, 85, 58, 88, 91, 97, 91, 88, 97, 97

• Mean ( ) median , mode

Draw a box plot of the data.
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Deeper Understanding

• Suppose there are 20 tests and the scores are all
  an 80. What would change if 2 more tests were
  added that were both a 90, mean or median?

• What if there were 20 tests, 4 were 70, 12 were
  80, and 4 were 90. Three more tests were added
  to group scoring 70, 90, and 100. How would
  the mean or median change?

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Cell phone activity
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