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The management of Recover Fast Hospital (RFH) claims that the average length of stay in their hospital after a

major surgery is less than the average length of stay at General Hospital (GH). The following data have been accumulated to test their claim.


Sample Size 16 26

Mean(in days) 4 5

Standard Dev .5 .75

test to see if the average length of stay in RFH is significantly less than the average stay at GH. let a=0.05. what is the value of the test statistic

a. t=-4.716

b. z=-4.716

c. t=-3.123

d. z=3.123

e. non of these

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