A two-tailed hypothesis test is being used to evaluate a treatment effect with α = .05. If the sample data produce a z-score of z = 2.24, then what is the correct decision?​Group of answer choices​Fail to reject the null hypothesis and conclude that the treatment has an effect.​Fail to reject the null hypothesis and conclude that the treatment has no effect.​Reject the null hypothesis and conclude that the treatment has no effect.​Reject the null hypothesis and conclude that the treatment has an effect.

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

A two-tailed test is conducted at the 5% significance level. Which of the following z-scores would lead to the rejection of the null hypothesis?Question 4Answera.1.67b.-2.06c.1.85d.-1.71

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?​Group of answer choices​The researcher should fail to reject H0 with either α = .05 or α = .01.​The researcher should change α.​The researcher should reject the null hypothesis with either α = .05 or α = .01.​The researcher should reject the null hypothesis with α = .05 but not with α = .01.

In a two-tailed hypothesis test the test statistic is determined to be Z = -2.5. The p-value for this test isQuestion 8Select one:a.0.4938b.-1.25c.0.0062d.0.0124

For a two-tail Z test, the null hypothesis will be rejected at the 0.05 level of significance if the value of the test statistic is