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Joe is measuring the widths of doors he bought to install in an apartment complex. He measured 72 doors and found a mean width of

Joe is measuring the widths of doors he bought to install in an apartment complex. He measured 72 doors and found a mean width of 36.1inches with a standard deviation of 0.3 inches. To test if the doors differ significantly from the standard industry width of 36 inches, he computes a z-statistic.

What is the value of Joe's z-test statistic?

1.81
-2.83
2.83
-1.81

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