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A computer laboratory manager was in charge of purchasing new battery packs for her lab of laptop computers. She narrowed her choices to two models that were available for her machines. Since the models cost about the same, she was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged. She took two independent samples and computed the following summary information:
Battery Pack Model 1
Battery Pack Model 2
Sample Size
9
Sample Mean
5 hours
5.5 hours
Standard Deviation
1.5 hours
1.3 hours
Using the null and alternate hypothesis:
H0:mu1-mu2=0 vs. Ha: mu1-mu2 not equal 0
Calculate the test statistic for this test.
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Oxytocin is a naturally occurring brain chemical that is nicknamed the "love hormone" because it seems to play a role in the formation of social relationships such as mating pairs and child-parent bonding.
We want to test the hypothesis that the population variances are equal.
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
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