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Topic: M&M's
Replies: 1   Last Post: Sep 12, 1996 2:25 PM

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Albyn Jones

Posts: 26
Registered: 12/6/04
Re: M&M's
Posted: Sep 12, 1996 2:25 PM
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>I haven't used m & ms at the beginning of the year, but last year I
>used them when we began hypothesis-testing, first to test whether the
>proportion of blue ones was the same as the proportion of the tan ones
> they replaced (using the proportion of tans given by Mars and
>published in Moore and McCabe), then to introduce Chi-Square
>goodness-of-fit tests (for the distribution of all colors). We found
>that there was *enormous* variation in proportions of each color
>between manufacturing lots. So if you buy all your bags from the
>same carton in the same store, you might get tons of yellows and
>almost no greens. The same goes for buying one 2-pound bag. So you
>have to get your students to spread out over town and buy bags of m &
>ms from a "random" selection of stores!

sounds like everyone is just working with the wrong model.

albyn jones

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