SCENARIO 10-12 A Quality Control Engineer Is in Charge of the Manufacture

question 202

True/False

SCENARIO 10-12
A quality control engineer is in charge of the manufacture of USB flash drives.Two different processes can be used to manufacture the flash drives.He suspects that the Kohler method produces a greater proportion of defects than the Russell method.He samples 150 of the Kohler and 200 of the Russell flash drives and finds that 27 and 18 of them,respectively,are defective.If Kohler is designated as "Group 1" and Russell is designated as "Group 2," perform the appropriate test at a level of significance of 0.01.
-Referring to Scenario 10-12,the same decision would be made with this test if the level of significance had been 0.05 rather than 0.01.

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Definitions:

Significant

Pertaining to results in statistical analysis, significant means the findings are unlikely to have occurred by chance and indicate a real effect or relationship.

Z-statistic

A statistical measure that quantifies the difference between a sample statistic and its population parameter, measured in units of the standard deviation.

Z-test

A statistical test used to determine whether there is a significant difference between the mean of a sample and the mean of a population, or between the means of two populations.

Z-statistic

A type of standard score that indicates how many standard deviations an element is from the mean of its distribution.