Wherever relevant set up the appropriate hypotheses, show the applicable calculations, and fully interpret all results and conclusions in addition to any other questions that may be relevant. Use a significance level of .05 if needed unless stated otherwise.

4) A production engineer wants to determine if two assembly lines are producing the same mean number of units daily.To test this:

• a sample of 10 days on line A reveals a meanof 110 units with a variance

of 200

• a sample of 15 days on line B reveals a mean of 100 units with a variance of

150.

Set up hypotheses and perform the appropriate test to resolve this question.

Fully interpret your results.