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The diameter of a spindle in a small motor is supposed to be 4.5 millimeters (mm)...

The diameter of a spindle in a small motor is supposed to be 4.5 millimeters (mm) with a standard deviation of 0.14 mm. If the spindle is either too small or too large, the motor will not work properly. The manufacturer measures the diameter in a sample of 17 spindles to determine whether the mean diameter has moved away from the required measurement. Suppose the sample has an average diameter of 4.41 mm. Ho: Ha:

math   Statistics-And-Probability   
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Answer #1

Solution :

This is the two tailed test .

The null and alternative hypothesis is ,

H0 :   = 4.5

Ha :    4.5

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