How much time to study is enough time? That's the question that was plaguing a history teacher (bet you thought I would use stats again). He decided to use the first month of the class to test this hypothesis by randomly assigning his lecture of 154 students into the following four groups: one hour of study for the week, two hours of study for the week, four hours of study for the week, and one group studied for eight hours that week. At the end of the month, the students have their first exam and the scores of the four groups are compared Test the hypothesis using an alpha of 0.05. Over the next series of questions, fill in the rest of the table:

What is the value for the dfb?

What is the value for the dfw?

What is the value for the between groups variance?

What is the value for the within groups variance?

What is the value for the obtained statistic?

Find the critical value.

What is your decision about the null hypothesis?

What type of error can the researcher be making?

	Sum of Squares	df	Mean Square	F	Fcrit	Decision
Study time	214.0
Residuals	1637.0