Question: please clearly state both the formula and method youre using. A factory produces bottles of water. Two different machines are used to fill empty bottles

please clearly state both the formula and method youre using.

A factory produces bottles of water. Two different machines are used to fill empty bottles with the water. The manager chooses a random sample of 50 bottles filled by machine A and a random sample of 60 bottles filled by machine B. The volumes of water, x and y, respectively, measured in appropriate units are summarized by x=45.5,x2=60.965,y=72.3,y2=132.2 Find a 90% confidence interval for the difference between the mean volume of water in bottles filled by machine B and the mean volume of water in bottles filled by machine A. A pooled estimate of the variance is

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