A quick but imprecise method of estimating the concentration of a polluting chemical in a vat has been  developed. Eight samples from the vat are analyzed by this method, as well as four samples by the  standard method, which is precise but slow. Compare the means to estimate whether the quick method  yields a systematic overestimate or underestimate at α = 0.05. The values by both the methods are  tabulated below. Use t test for unequal population variances. Standard Quick 25 23 24 18 25 22 26 28 17 25 19 1

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