When analyzing data from experiments that involve more than two groups _________.
a. doing t tests on all possible pairs of means decreases the probability of making Type I errors
b. doing t tests on all possible pairs of means increases the probability of making Type I errors
c. it is generally permissible to do t tests between all possible pairs of means and use Student's t distribution
d. doing t tests on all possible pairs of means increases the probability of making Type II errors
Question 2
A major limitation of a two group design is that _________.
a. we can't run enough subjects
b. very often, two groups are insufficient for a clear interpretation
c. the population parameters may not be applicable
d. the means between groups may not differ
Nitrogen fluxes in Sycamore Creek, Arizona (data from Grimm 1988).
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