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 =σ3.1 . They weigh this weight on the scale 55 times and read the result each time. The 55 scale readings have a sample mean of =x999 grams. The calibration point is set too low if the mean scale reading is less than 1000grams. The technicians want to perform a hypothesis test to determine whether the calibration point is set too low. Use the =α0.01level of significance and the P-valuemethod with the table.   what is the z value

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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

=σ3.1

. They weigh this weight on the scale

55

times and read the result each time. The

55

scale readings have a sample mean of

=x999

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

1000grams. The technicians want to perform a hypothesis test to determine whether the calibration point is set too low. Use the
=α0.01level of significance and the
P-valuemethod with the table.
 
what is the z value
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