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TABLE 9-6
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture. She performs a two-tail test of the null hypothesis that the mean for the stressed oak furniture is 650. The calculated value of the Z test statistic is a positive number that leads to a p-value of 0.080 for the test.
-Referring to Table 9-6, suppose the engineer had decided that the alternative hypothesis to test was that the mean was greater than 650. Then if the test is performed with a level of significance of 0.05, the null hypothesis would be rejected.
Wilcoxon Rank Sum Test
A nonparametric statistical test that compares two independent samples to determine if they come from the same distribution.
Location Of Population
Refers to the geographical area or habitat occupied by a group of individuals or species.
Independent Samples
Data sets that are collected from different populations, where the measurements from one sample do not influence or are not related to those from another.
Normal Approximation
A method used in statistics that approximates a binomial distribution with a normal distribution when the sample size is large enough.
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