Finding a p-value in goodness of fit test

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This is the same result as in R proper. See this example.

However, as this post points out,

Unlike most statistical packages, the default assumes unequal variance and applies the Welsh df modification.

I don't know much about t tests, and nothing about Maple and stats, so you will have to find out what is up, but my guess is that this has something to do with it.

On another note, if you are only doing statistics, you may wish to use R more directly, as Sage's interface is somewhat cumbersome. (It is quite useful for going back and forth with stuff, though, as I've profited from it myself.)