(Solution) - Two fuel additives are being tested to determine their effect -(2025 Original AI-Free Solution)

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Two fuel additives are being tested to determine their effect on gasoline mileage. Seven cars were tested with additive 1 and nine cars were tested with additive 2. The following data show the miles per gallon obtained with the two additives. Use ? = .05 and the MWW test to see whether there is a significant difference between gasoline mileage for the two additives.
Additive 1 Additive 2
17.3 ............ 18.7
18.4 ............ 17.8
19.1 ............ 21.3
16.7 ............ 21.0
18.2 ............ 22.1
18.6 ............ 18.7
17.5 ............ 19.8
20.7
20.2