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Descriptive Statistics. Open the dataset ‘ ex02-01.mtp ’ using File  Open Worksheet . Data of breaking strength of wood (lbs). We will use Minitab’s descriptive statistics module to calculate the mean, standard deviation, interquartile range and the five-number summary .

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descriptive statistics
Descriptive Statistics
  • Open the dataset ‘ex02-01.mtp’ using File Open Worksheet.
    • Data of breaking strength of wood (lbs).
  • We will use Minitab’s descriptive statistics module to calculate the mean, standard deviation, interquartile range and the five-number summary.
descriptive statistics2
Descriptive Statistics
  • First calculate the mean, std dev and IQR.

Select Stat

 Basic Statistics

 Display Descriptive Statistics

Select strength as the Variable.

Click on the Statistics button

descriptive statistics3
Descriptive Statistics

Select Mean, Standard Deviation and Interquartile range

Make sure you unselect any of the other statistics

Click OK twice.

Descriptive Statistics: strength

Variable Mean StDev IQR

strength 30841 3019 2473

five number summary
Five-Number Summary

From the menu bar select Stat

 Basic Statistics

 Display Descriptive Statistics

In the window, select strength as the variable

click the Statistics button

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Five-Number Summary

Select First quartile

 Median

 Third quartile

 Min

 Max

click OK twice

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Five-Number Summary

Descriptive Statistics: strength

Variable Minimum Q1 Median Q3 Maximum

strength 23040 30243 31975 32715 33650

box plot
Box Plot
  • The box plot in Minitab is constructed in the standard way:
    • The box is the interquartile range (IQR )
      • 1st quartile is lower horizontal line and 3rd quartile is upper horizontal line
    • The line in the middle of the box is the median (Q2 or 50th percentile).
    • The whiskers represent 1.5 x IQR for the upper and lower.
      • The IQR is a robust estimate of dispersion and is ~1.35.
    • The asterisk (*) represents an outliervalue.
box plot8
Box Plot
  • Open the dataset ‘ex02-12.mtp’
    • Data of counts of trees for different plots.
  • A Box plot using theWith Groupsoption is used to examine the location and dispersion of a variable with several categories.
box plot9
Box Plot

Select Graphs

 Boxplot from the menu bar.

In the Boxplots window select One Y, With Groups.

Click OK

box plot10
Box Plot

Select trees for the Graph variable

Select group for the Categorical variable

click OK