A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to increase scores. The hypothesis test produces a calculated z-score of z = 2.37. If the researcher is using a one-tailed test, what is the correct statistical decision?​     ​This cannot be answered without additional information.     ​Reject the null hypothesis with α = .05 but not with α = .01.     ​Fail to reject the null hypothesis with either α = .05 or α = .01.     ​Reject the null hypothesis with either α = .05 or α = .01.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.