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10.5 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 of each type 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% level of significance.

EngineSample mean number of RPMPopulation standard deviation
11,50050
21,60060

OpenStax Introductory Business Statistics 2e, 10.5 Two Population Means with Known Standard Deviations, exercise 2

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Adapted from Introductory Business Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Business Statistics 2e. Imported at revision 50ec917.