[patch #6229] Independent Samples T-Test dialog

[John Darrington]

Follow-up Comment #4, patch #6229 (project pspp):

> It is not obvious to me from the interface that clicking Continue > in the
Define Groups dialog box enables grouping and that clicking Cancel disables
it, but I think that that is what happens. > It would be clearer if there were
a radio button selection: "Do not group" versus "Divide into two groups:", or
something equivalent. 

That's not what it does.  There are always two groups defined. A T-Test is
meaningless otherwise. The Define Groups dialog box allows you to choose the
values (of the grouping variable) which determine which cases belong to which
group.

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