What is the purpose of a tukey test?
Why can't we compare all the posible pairs of group means using the two-sample t-test?

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  1. The Tukey HSD test looks at the probability of making one or more Type I errors (rejecting a true null hypothesis) in comparing population means and is sensitive to treatment errors. Could we use 2-sample t-tests? No. Multiple t-tests increase the probability of making a Type I error.

    I hope this helps.

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