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Hypothesis test for the difference between two means.
Grand Strand Family Medical Center is specifically set up to treat minor medical emergencies for visitors to the Myrtle Beach area. Ther are two facilities, one in the Little River Area and the other in Murrells Inlet. The Quality Assurance Department wishes to compare the mean waiting time for patients at the two locations. Samples of the waiting times, reported in minutes, follow:
Location
Waiting time
Little River
31.73
28.77
29.53
22.08
29.47
18.60
32.94
25.18
29.82
26.49
Murrells Inlet
22.93
23.92
26.92
27.20
26.44
25.62
30.61
29.44
23.09
23.10
26.69
22.31
Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
When 319 college students are arbitarily selected and surveyed, it is observed that 120 own a car. Determine a 99% confidence interval for true proportion of all college students who own a car.
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Suppose it costs $25 per student for the administrators to provide the course materials.
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The researcher will then compare the scores for the two treatments. If there is a difference between the two groups of scores. Briefly explain how the difference simply may be sampling error.
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Researcher is interested in testing whether there are differences in mean between population one and population two.
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