Question: Cost. Refer to Problem 71. (A) Find a cubic regression equation for the data, and graph it and the data set in the same viewing

Cost. Refer to Problem 71.
(A) Find a cubic regression equation for the data, and graph it and the data set in the same viewing window.
(B) Use the regression equation and a numerical integration routine on a graphing calculator to approximate (to the nearest dollar) the increased cost in going from a production level of 1 thousand sunglasses per month to 7 thousand sunglasses per month.

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