(a) Use a t test to investigate whether flooding has the same effect in river birch and in European birch. Use a nondirectional alternative and let α = 0.05. (The pooled standard deviation is Spooled = 0.199.)
(b) If the sample sizes were n = 10 rather than n = 4 for each group, but the means, standard deviations, and Spooled remained the same, how would the result of part (a) change?