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stats hw 3

stats hw 3 - Joseph so 8 75.5 about three fourths 10 the...

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Joseph so 8 – 75.5%, about three fourths 10 – the standard deviation of the residual, or the average error between the horsepower and predicted mpg had a standard deviation of 3.287 11 – y = 12.5 +.75x b – y = 23.2 – 8x c – y – 152, sy = 30 d – y – 25, r - .6 22 - a – I assume that the student is referring to the r^2, misinterpreting the meaning of the r squared as a casual link between literacy and life expectancy. However as we know r squared only represents the fraction of the data variation between the two variables. B – slope of regression lines are the correlation coefficient multiplied by the standard deviations of y or x. meaning that slop only shows the strength and association of the regression line multiplied by the average distance the x and y points are from actual data. Meaning that the slope can actually say that a 5% increase will actually raise life expectancy by two years. 28 – A ride that is one foot higher will on average tend to be .242 seconds longer.

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stats hw 3 - Joseph so 8 75.5 about three fourths 10 the...

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