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Construct a 90% prediction interval for sales when the total sq footage is 4.2 billion. The equation of the regression line is yhat=499.967x - 1595.147

total sq footage, x: 4.9 5.1 5.2 5.3 5.4 5.6 5.9 5.9 6.1 6.1
sales, y: 875.8 940.8 987.9 1064.8 1121.3 1206.4 1284.1 1340.5 1432.5 1542.6

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