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Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
Auto crank shafts. Here are measurements (in millimeters) of a critical dimension for 16 auto engine crankshafts:
224.120 224.001 224.017 223.982 223.989 223.961
223.960 224.089 223.987 223.976 223.902 223.980
224.098 224.057 223.913 223.999
The dimension is supposed to be 224 mm and the variability of the manufacturing process is unknown. Is there evidence that the mean dimension is not 224mm?
1. The appropriate test to use is
a. T Test
b. 1-Prop Z test
c. Z Test
d. Paired T test
2. The appropriate type of test to use based on the tails of the distribution
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Applications of Different Observational Study Designs' indicating for every objective under pertinent study design.
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