car company claims that their Super Spiffy Seda averages 31mpg. You randomly select 9 Super Spiffies from your local dealerships and test their gas mileage under similar conditions. You find that the average number of miles per gallon for your sample is 29 with a standard deviation of 2.78. Does the actual gas mileage for these cars I deviate significantly from 31? (Use alpha of .05) 5.

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5. A car company claims that their Super Spiffy Seda averages 31mpg. You randomly
select 9 Super Spiffies from your local dealerships and test their gas mileage under
similar conditions. You find that the average number of miles per gallon for your sample
is 29 with a standard deviation of 2.78. Does the actual gas mileage for these cars
I deviate significantly from 31? (Use alpha of .05)
Transcribed Image Text:5. A car company claims that their Super Spiffy Seda averages 31mpg. You randomly select 9 Super Spiffies from your local dealerships and test their gas mileage under similar conditions. You find that the average number of miles per gallon for your sample is 29 with a standard deviation of 2.78. Does the actual gas mileage for these cars I deviate significantly from 31? (Use alpha of .05)
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