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 exactly1000grams. The standard deviation for scale reading is known to be=σ3.1. They weigh this weight on the scale55times and read the result each time. The55scale readings have a sample mean of=x999grams. The calibration point is set too low if the mean scale reading is less than1000grams. 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 theP-valuemethod with the table. what is the z value

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MATLAB: An Introduction with Applications

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ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

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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

times and read the result each time. The

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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