Solved: Battery Voltage Two brands of batteries are
Chapter 9, Problem 20(choose chapter or problem)
Battery Voltage Two brands of batteries are tested, and their voltage is compared. The data follow. Find the 95% confidence interval of the true difference in the means. Assume that both variables are normally distributed. Brand X Brand Y 9.2 volts 8.8 volts s1 0.3 volt s2 0.1 volt n1 27 n2 30 X1 X2
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