Calibrating a scale: Making sure that the scales used by businesses in the United States are accurate is the responsibility of the National Institute for Standards and Technology (NIST) in Washington, D.C. Suppose that NIST technicians are testing a scale by using a weight known to weigh exactly  1000  grams. The standard deviation for scale reading is known to be  =σ2.5 . They weigh this weight on the scale  48  times and read the result each time. The  48  scale readings have a sample mean of  =x998.9  grams. The calibration point is set too low if the mean scale reading is less than  1000  grams. The technicians want to perform a hypothesis test to determine whether the calibration point is set too low. Use the  =α0.01  level of significance and the  P -value method Compute the value of the test statistic. Round the answer to two decimal places.   z =

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Calibrating a scale: Making sure that the scales used by businesses in the United States are accurate is the responsibility of the National Institute for Standards and Technology (NIST) in Washington, D.C. Suppose that NIST technicians are testing a scale by using a weight known to weigh exactly 

1000

 grams. The standard deviation for scale reading is known to be 

=σ2.5

. They weigh this weight on the scale 

48

 times and read the result each time. The 

48

 scale readings have a sample mean of 

=x998.9

 grams. The calibration point is set too low if the mean scale reading is less than 

1000

 grams. The technicians want to perform a hypothesis test to determine whether the calibration point is set too low. Use the 

=α0.01

 level of significance and the 

P

-value method

Compute the value of the test statistic. Round the answer to two decimal places.

 

z
=
 
 
 
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