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A researcher expects a treatment to produce an increase in the population mean. The treatment is evaluated using a one tailed hypothesis test, and the test produces z = +2.15. Based on this result, what is the correct statistical decision? Select one: a. The researcher should change α. b. The researcher should reject the null hypothesis with α = .05 but not with α = .01. c. The researcher should fail to reject H0 with either α = .05 or α = .01. d. The researcher should reject the null hypothesis with either α = .05 or α = .01.
Sagot :
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