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 = +1.85.Based on this result, what is the correct statistical decision? A)The researcher should reject the null hypothesis with α = .05 but not with α = .01. B)The researcher should reject the null hypothesis with either α = .05 or α = .01. C)The researcher should fail to reject H₀ with either α = .05 or α = .01. D)cannot answer without additional information

Question

Quizplus · Accepted Answer

The critical value for a one-tailed test with α = .05 is approximately +1.645, and for α = .01, it is approximately +2.33. Since +1.85 is greater than +1.645 but less than +2.33, the null hypothesis can be rejected at α = .05 but not at α = .01.

A Researcher Expects a Treatment to Produce an Increase in the Population