Question: =+a. Use the pooled t test (based on assuming normality and equal standard deviations), described in Exercise 37, to decide at significance level .05 whether

=+a. Use the pooled t test (based on assuming normality and equal standard deviations), described in Exercise 37, to decide at significance level

.05 whether the two concentration distribution means are equal.

b. If 1

* and 2

* , the standard deviations of the

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