Question

# 1 20.8 1 20.4 1 25.1 1 27.4 1 15.4 1 15.3 1 13.9 2 16.3...

1 20.8 1 20.4 1 25.1 1 27.4 1 15.4 1 15.3 1 13.9 2 16.3 2 14.5 2 10.4 2 12.2 2 12.5 2 9.5 2 15.3 3 16.8 3 20.9 3 28.4 3 22.5 3 17.5 3 14.9 3 22.4 3 17.5 3 25.4 3 22.4 4 16.7 4 14.5 4 13.7 4 15.4 4 12.4 4 16 4 7.5 4 12.9 4 18.310.

What was the margin of error for the confidence interval for gasoline mileage of make 2?

What is the value of the t test statistic for testing the hypothesis that makes 2 and 3 do not differ in mileage?

Excel output:

 1 20.8 2 16.3 3 16.8 4 16.7 1 20.4 2 14.5 3 20.9 4 14.5 1 25.1 2 10.4 3 28.4 4 13.7 1 27.4 2 12.2 3 22.5 4 15.4 1 15.4 2 12.5 3 17.5 4 12.4 1 15.3 2 9.5 3 14.9 4 16 1 13.9 2 15.3 3 22.4 4 7.5 3 17.5 4 12.9 3 25.4 4 18.31 3 22.4 Mean 2 AVERAGE(D1:D7) 12.95714 Mean 3 20.87 sd 2 STDEV(D1:D7) 2.527091 sd 3 4.209526

1.

Margin of error for the 95% confidence interval for gasoline mileage is,

2.

Hypothesis:

Test statistic,

where,

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