1.A researcher conducts a hypothesis test to evaluate the effect of a treatment.

Question

1.A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test produces a z-score of z = -3.60. Assuming that the researcher is using a two-tailed test, what is the correct statistical decision?

2.A researcher uses a hypothesis test to evaluate H0 m = 80. Which combination of mean and standard deviation is most likely to result in rejecting the null hypothesis

3.A researcher uses a hypothesis test to evaluate H0 m= 80. Which combination of sample mean and alpha level (a) is most likely to result in rejecting the null hypothesis

4.A sample of n = 25 individuals is selected from a population with m = 60 and s = 10 and a treatment is administered to the sample. After treatment, the sample mean is M = 63. What is the value of Cohen's d for this sample

5.A treatment is administered to a sample selected from a population with a mean of m = 80 and a standard deviation of s = 10. After treatment, the effect size is measured by computing Cohen's d, and a value of d = 0.60 is obtained. Based on this information, the mean for the treated sample is M =

Explanation / Answer

Solution:

Reject the null hypothesis with alpha = 0.05 but not with alpha = 0.01

Explanation:

for alpha = 0.05 -> critical value(two-tailed test) = 1.96

or alpha = 0.01 -> critical value(two-tailed test) = 2.57

so for alpha = 0.05, |z| > critical value

so reject the null hypothesis

and also for alpha = 0.01, |z| < critical value

so do not reject the null hypothesis

2)  The combination of factors is most likely to result in rejecting the null hypothesis is

= 5 and n = 50B

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