Question: 20. A pooled variance allows us to: A) calculate a z score B) get two different values for the mean C) get one value for

20. A pooled variance allows us to: A) calculate a z score B) get two different values for the mean C) get one value for variance with unequal sample variances D) get one value for mean with unequal sample sizes 21. If EX = 60 and N = 20,is equal to
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