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please show the formula

Note: Answer Questions 1-2 by Using the TI-30XA (or other approved) Calculator IMPORTANT: Make sure to round answers accordin
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Note: Answer Questions 1-2 by Using the TI-30XA (or other approved) Calculator IMPORTANT: Make sure to round answers according to instructions before entering them below. Economists wish to look at the relationship between the price of regular unleaded gasoline in the U.S. (units S/gallon) and the acquisition cost of OPEC crude olil (units $10/barrel). Summary measures for a random sample of 13 years are given below
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