Mathematics, 21.01.2021 21:50 wendy1538
If the standard deviation of shear strength measurements for spot welds is 9.5 pounds per square inch (psi), what is the minimum number of test welds that should be sampled if we want the sample mean to be within 1.4 psi of the true mean with probability approximately 0.99
Answers: 2
, where 
= standard deviation, E = margin of error, z* = critrical z-value.
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If the standard deviation of shear strength measurements for spot welds is 9.5 pounds per square inc...
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