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Unformatted text preview: b. z = -2.24 c. H 0 is rejected 30. a. z = -1.918 b. The test statistic for a mean when is known is z. Transforming the production data to standard units (z values) permits their use not only in the problem but also in other hypothesis-testing problems. c. .0274 48. t = 1.50; do not reject 52. z = 0.841; do not reject...
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- Spring '11