Amanufacturer of carpentry screws claims that its production machine is very accurate and that the standard deviation of the length of all screws produced is .08 mm or less. a sample of 30 screws showed a standard deviation of .10. the test statistic to test the manufacturer's claim is

a. 45.31
b. 23.2
c. 18.56
d. 19.2

Option A) 45.31

Step-by-step explanation:

We are given the following information in the question:

Population standard deviation, σ = 0.08

Sample size, n = 30

Sample standard deviation, s = 0.10

Test statistic =

Option A) 45.31

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step-by-step explanation:

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

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