The diameter of a spindle in a small motor pool is supposed to be 5 millimeters.  If the spindle is too large or too small, the motor will not perform properly.  The manufacturer measures the diameter in a sample of 225 motors and calculates the sample mean diameter as 4.89 millimeters.  We wish to test if the mean diameter is 5 millimeters.  Which of the following are the appropriate null and alternative hypotheses, letting μ denote the average diameter of all spindles?   The null hypothesis is H0:                             ["", "", "", ""]            The alternative hypothesis is Ha:

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