Midterm 2 Review

With alpha of .05 in one tail, what value defines the critical region on positive side?

What is the effect size of this study?

With sample size n=40 and t=1.8, given α = 0.05, do we REJECT or FAIL TO REJECT the null hypothesis?

State the null and alternative hypotheses. 

Compute df Between Groups

Which scenario best fits a z-test?

With F=12 and α=.05 would you say there is a significant impact of IV on DV?

What should be concluded based on the test illustrated?

Inferential statistics: compare a test statistic against a population mean and critical values/regions (given by α) in

Is this a one-tailed or a two-tailed test?

If H₀ is false and the statistician chose not to reject the null hypothesis, what has occurred?

What is your decision?

Compute MS Within

What is the critical region in a hypothesis test?

We can only prove the null hypothesis (H₀) when our p-value is extremely large.

What should be concluded based on the test illustrated?

Compute SS Within Groups

What are the critical values corresponding to a two-tailed test with α=0.05?

What is the upper tail critical value corresponding to a one-tailed test with α=0.01?

A statistically significant difference (p < α) means the difference is likely too large to be due to chance alone.

Given sample size, alpha, and whether 1- or 2-tailed, what ELSE do we need to make a H₀ decision using the t table?

What additional information does effect size provide?

Which scenario best fits an independent samples t-test?

Compute MS Between

Which scenario best fits a related samples t-test?

Which scenario best fits a one sample t-test?

What would you expect the sample mean to be if H0 is True

State the null and alternative hypotheses. 

How does increasing sample size effect the probability of a Type II error?

If H₀ is true and the statistician chose not to reject the null hypothesis, what has occurred?

What does the level of significance indicate?

If H₀ is true and the statistician chose to reject the null hypothesis, what has occurred?

Compute F

What is the test statistic for the sample mean?