Question

Statistical Inference.

I Need help with the questions below:

4-You are testing for significant differences between the mean scores of 2 groups. You set the level of significance at 0.05 if the mean differences is so large that it would occur by chance 1% of the time, would you accept or reject the null hypothesis?

-Accept H0

-Rejected H0

5-When you make a prediction about the direction of mean differences between an experimental and a control group, would you use a 1-tailed or 2-tailed test of significance?

- 1-tailed

- 2-tailed

Answer 1

Solution :

4) Since, occurrence of the mean difference by chance is 1% = 0.01, which is less than the significance level of 0.05, therefore we would reject the null hypothesis.

5) When we make a prediction about the direction of mean differences between an experimental and a control group, we would use 1- tailed test of significance, because for directional hypothesis always one-tailed test of significance is used.