Gasoline Prices and Fuel Efficiency Narrative

Gasoline Prices and Fuel Efficiency Narrative.
When the price of gasoline gets high, consumers become very concerned about the gas mileage obtained by their cars. One consumer was interested in the relationship between car engine size (number of cylinders) and gas mileage (miles/gallon). The consumer took a random sample of 7 cars and recorded the following information:
n = 7, ?x_i = 24.7, ?y_i = 177, ?x_iy_i = 600.7, s_x = 1.2406,
and
s_y=4.3861
-Refer to Gasoline Prices and Fuel Efficiency Narrative. What fuel efficiency would you predict for a car with a 6-cylinder engine?

Correct Answer:

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= -3.115 ...

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