Using Minitab in M 358K

General Comments

Using Minitab on a Math Department Computer

Using Minitab on Another Computer

To Make a Stemplot, Histogram, or Box-Plot

                Type c and the column number of the variable you want (e.g., c1, c2, etc.) in the Variables box.
        Type the name of the variable (as listed at the top of the column) in the Variables box.              
        Type the name of the variable in single quotes.
        Click on the entry in the box in the left of the dialogue box, then click Select.
        Double click on the entry in the box at the left of the dialogue box.

Notation Used in the Remainder of These Notes: 

XX > YY > ZZ means:
       From the menu XX, choose YY;  then choose ZZ from the resulting menu.

To find mean, standard deviation, median, and quartiles: 

Use Stat > Basic Statistics >   Display Descriptive Statistics. (The last menu might be called just Descriptive Statistics on older releases.) You can get statistics on more than one variable at once by  putting all the variables of interest in the dialogue box.

To make a normal quantile plot:

Note: Graph > Normal Probability Plot will give you a normal probability plot, which is like a normal quantile plot with the axes reversed.

To  make a scatter plot:

    a. Use the pull-down menu in “For each” to choose “group”.

    b. Enter the column with the group labels (e.g., for male or female) in the space under Group Variables. (You can use Edit Attributes to choose symbols other than the default.)

To calculate the correlation coefficient r

 Use Stat > Basic Statistics > Correlation. Enter the two variables (columns) you want  the correlation of, and click OK.  Ignore any extra information you get.

To calculate a function of every entry in a column (e.g., to find 1/x for every x in a column)

 Use Calc > Calculator (or Mathematical Expressions on some older releases). “Variable” is where you want the calculations to be stored. Type  the expression you want in terms of the column or variable you want to transform. (e.g., 1/c1 will give the reciprocals of the entries in c1.) You can use the keypad provided  in the dialogue box rather than the regular keyboard, if that is more convenient. Use * for multiplication and ** for an exponent (e.g., (c1)**2 for c1-squared). For functions like logarithms, as well as things like min and max, you can use the scroll down menu at the right of the dialogue box. Remember parentheses.

To find a regression equation

To  make a scatter plot with two regression lines plotted on it

Copying Columns and Finding Row or Column Sums

To find the p-value for a particular t-value

 Use  Calc > Probability Distributions > t...

Check “Cumulative probability.” Enter the degrees of freedom in the appropriate box, then check “Input constant” and enter the t-value in the box. Click OK, and the left-tail probability should appear in the session window. (You can figure out what to do if you need the right-tail probability.)

To do t and z procedures and tests for proportions:

Use Stat > Basic Statistics > (t, z, etc. as appropriate). Then check the appropriate items and fill  in the appropriate boxes in the dialogue box. (The item “mean’ in the one-variable t-test refers to the value of the mean specified in the null hypothesis.)

To do  a chi-squared test:

To find confidence and prediction intervals for regression