# Hypotheses Testing-Two way ANOVA

#### LDouble

##### New Member
Hello,

I am new to statistics as well as this thread...I have read, sought you-tube videos and I'm still not understanding. At this point I have been given the task of writing up how I propose to test an hypothesis but I am missing some important information according to my professor.

I am doing a study on the effects of In School suspension(ISS), Out of school suspension (OSS) and a combination of ISS/OSS on the Georgia Criterion Referenced Competency Test (GCRCT).

11-12 scores will be used as baseline
12-13 scores will be tested for difference

I have chosen to do a two-way ANOVA but there is a disconnect of what I'm testing for...my professor says I need explain what/how I will be calculating the main and interaction effects.

So far this is what I have:
H1o No difference exists in the reading GCRCT scores between students who have had an increase/decrease of ISS days.

***The red is where I messed up***

Answer: A two way between subjects ANOVA will be performed to test the hypothesis. This analysis will be used to examine the differences in test scores based on the independent variables. The mean square will be calculated for the main effect . A significance level of .05 will be used to reject or fail to reject the null hypothesis.

#### bruin

##### Member
Answer: A two way between subjects ANOVA will be performed to test the hypothesis. This analysis will be used to examine the differences in test scores based on the independent variables. The mean square will be calculated for the main effect . A significance level of .05 will be used to reject or fail to reject the null hypothesis.
Main effect of what? Factor A, or Factor B? (Hint: You need to test both, and the interaction as well.) An alpha of .05 will be used to make a decision about what hypothesis? (Hint: You have three separate F's to evaluate, three separate null hypotheses to test).

Look up what the ANOVA summary/source table looks like for a two-way ANOVA. Set that up first: it will guide you through the problem.

Also, ask yourself if ISS and OSS are between- or within-subjects variables, as that will determine in part what your source table looks like.