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The probability of committing a type i error is equal to which of the following? significance level, α type i error type ii error p-value alternative hypothesis

  usually, loads of more than pounds require the assistance of a second person.           a. 40   b. 20   c. 50   d. 30

The double-blind procedure is most for a.random assignment b.the placebo effect c.operational definitions replication d. standard deviations