In Exercises, hypothesis tests are proposed. For each hypothesis test, a.identify the variable.b.identify the two populations.c.determine the null and alternative hypotheses.d.classify the hypothesis test as two tailed, left tailed, or right tailed. Neurosurgery Operative Times. An Arizona State University professor, R. Jacobowitz, Ph.D., in consultation with G. Vishteh, M.D., and other neurosurgeons obtained data on operative times, in minutes, for both a dynamic system (Z-plate) and a static system (ALPS plate). They wanted to perform a hypothesis test to decide whether the mean operative time isless with the dynamic system than with the static system.

Question

In Exercises, hypothesis tests are proposed. For each hypothesis test,

a.identify the variable.
b.identify the two populations.
c.determine the null and alternative hypotheses.
d.classify the hypothesis test as two tailed, left tailed, or right tailed.

Neurosurgery Operative Times. An Arizona State University professor, R. Jacobowitz, Ph.D., in consultation with G. Vishteh, M.D., and other neurosurgeons obtained data on operative times, in minutes, for both a dynamic system (Z-plate) and a static system (ALPS plate). They wanted to perform a hypothesis test to decide whether the mean operative time is
less with the dynamic system than with the static system.

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