The data shown in the following table are highway gasoline mileage performance and engine displacement for a sample of 20 cars. Make Model MPG (highway) Engine Displacement (in3) Acura Legend 30 97 BMW 735i 19 209 Buick Regal 29 173 Chevrolet Cavalier 32 121 Chevrolet Celebrity 30 151 Chrysler Conquest 24 156 Dodge Aries 30 135 Dodge Dynasty 28 181 Ford Escort 31 114 Ford Mustang 25 302 Ford Taurus 27 153 Ford Tempo 33 90 Honda Accord 30 119 Mazda RX-7 23 80 Mercedes 260E 24 159 Mercury Tracer 29 97 Nissan Maxima 26 181 Oldsmobile Cutlass 29 173 Plymouth Laser 37 122 Pontiac Grand Prix 29 173   Find the standard error of estimate.

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A: Introduction - Mean or average = Sum of observations total number of observations

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.