A popular myth is that for identical twins, one is the "nice one" and one is the "mean one." Four-teen pairs of identical twins were randomly selected and given a personality test for measuring "niceness" or "meanness" where the higher score implies "niceness" and a lower score implies "meanness." At the 1% significance level, is there a difference in the personality scores between the identical twins.

what is the null and alternative hypothesis?

what is the observed value?

what is the p-value

add JMP output.

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