A health psychologist conducts an experiment to determine whether the type of drink a student has affects the ability to maintain sustained attention in a stats class. Eighteen individuals are randomly divided into 3 groups: One group that gets no coffee, one group that gets an energy drink, and one group that gets water. All three groups are instructed to take the drink 30 minutes before the stats class begins, and then given a short, 10-question T/F quiz on the material they just learned. The data in the file labeled "coffee study" on Blackboard shows the scores for this experiment. Answer the following:

Using an alpha of 0.01, what is the critical value?

Is the assumption of homogeneity of variances met?

Report the value of the obtained statistic for the researcher's study (the omnibus test).

What is your decision about the null?

Compute the effect size. Be sure to show your work and interpret the effect.

What type of error can the researcher be making?

Given the considerations of the decision about the null and analysis of the effect, what should the researcher conclude about their study?

Data:

Quiz Scores	Drink
7	Coffee
8	Coffee
9	Coffee
7	Coffee
5	Coffee
10	Coffee
8	Energy
6	Energy
7	Energy
9	Energy
8	Energy
5	Energy
6	Water
7	Water
7	Water
9	Water
8	Water
8	Water