What proportion of scores fall above the z-score of 1.88?

A Factorial ANOVA has 3 levels for factor A and 8 levels for factor B and uses 5 participants in each treatment condition. What is the total number of participants needed for the study?

Under what circumstances are post-hoc tests (also called posttests) necessary?

An independent-measures research study uses two samples, each with n = 12, to compare two treatments. If the results are evaluated with a t statistic using a two-tailed test with α = .01, then what are the boundaries for the critical region?

A population has a µ=120 and a standard deviation of 8. If the population distribution is normal, what is the probability of obtaining a sample mean greater than M= 125 for a sample of n=16?

If the results of a two-factor experiment are presented in a line graph, then what pattern appears in the graph if there is an interaction?

Calculate standard deviation for the following sample of exam scores: 6, 7, 4, 5, 8, 9.

If z obtained does not exceed the z critical, what decision do you make?

A researcher performs a hypothesis test using a one-sample t statistic and the results are reported as follows: “t(30) = 3.25, p < .05.” Based on this report, how many individuals were in the sample?

A population has a µ=120 and a standard deviation of 8. If the population distribution is normal, what is the probability of obtaining a sample mean greater than M= 125 for a sample of n=16?