Most of the instructions for doing chapter 3 stuff in Minitab are 
given in the lab book, and we'll have practice with that in lab 3, 
so I'm just going to give here the instructions for DoStat:
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Instructions for using DoStat for HW 3

1)  As usual, log on at www.dostat.com, click "data sets", then "sample data."

2)  Click on any of the sample data sets to bring up a data window.
Then click "data", then Load data "from paste".  In the input box, 
type or paste the data with the values IN COLUMNS, each column 
representing one variable.  For example, for problem 3.8, you 
would type:

X Y
2 80 
5 80 
1 70 
4 90
2 60

Make sure the box "Use first line as variable names" is checked, if
your first line of data is indeed the variable names, as above.

(If there's just a single variable in the data set, you may type the data 
all in one column, with a name for the variable at the top line.)

Note that if you're pasting data from an outside file, you can use the right 
mouse button to paste in the window.

3) Click "load data".  The data you've typed should appear in the data window.

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Analyses for bivariate data:
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(a) 2 categorical variables

** For a contingency table:

Click "Stat", then: Tables "Contingency".

Select one of the variables to be the row variable and the other to be the column variable.

Click "calculate".

(b) 1 categorical, 1 numerical variable

** For side-by-side summary statistics:

Click "Stat", then: Summary stats "columns".

Double-click on the numerical variable to select it, then choose the 
categorical variable in the "group by" space.  (make sure "table groups by 
each column" is selected)

Click "calculate".

** For side-by-side box plots:

Click "Graphics", then "Boxplot".

Double-click on the numerical variable to select it, then choose the 
categorical variable in the "group by" space.  (make sure "plot groups for 
each column" is selected)

Click "Create graph".

(c)  2 numerical variables:

** To create a scatterplot:

Click "Graphics", then "Scatterplot".

Select one variable to be the X variable and the other to be the Y variable.

Click "Create graph".

** To calculate the correlation coefficient

Click "Stat", then: Summary stats "correlation".

Select the TWO variables you want to calculate the correlation for.

Click "Calculate".

** To calculate the equation of the regression line

Click "Stat", then: Regression "Simple Linear".

Select the X-variable (independent) and the Y-variable (dependent).

Click "Calculate".  The value of b_0 will be under "Estimate" next to 
"Intercept" and the value for b_1 will be under "Estimate" next to the 
name of the independent variable.

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For all plots and results:
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Clicking "Save/print" will open up a window from which you can save and 
print results if you wish.