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10.2 Exercise 2

Avg difficulty 2.5

The means of the number of revolutions per minute of two competing engines are to be compared. Thirty engines are randomly assigned to be tested. Both populations have normal distributions. the table shows the result. Do the data indicate that Engine 2 has higher RPM than Engine 1? Test at a 5 percent level of significance.

EngineSample Mean Number of RPMPopulation Standard Deviation
11,50050
21,60060

OpenStax Statistics, 10.2 Two Population Means with Known Standard Deviations, exercise 2

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