week 12 discussion

DSRT 734 M51

INFERENTIAL STATISTICS FOR DECISION MAKING

Week-12 Discussions and Questions

After reading your textbook, I want you to have a good understanding of the fundamentals of each chapter and show it to me. Please don’t copy & paste from your textbook or some other online source. In other words, don’t plagiarize. You can read online material if it helps to understand the material, but you have to write your own sentences.

Chapter-13 topics Discussions and questions:

1. Explain the following terms

a) Factorial designs

b) Factor

c) Cell

d) Main Effect

e) Interaction

2. An F value of 2.75 was obtained when an interaction mean square was divided by an error mean square. The degrees of freedom were 6 and 18. If = .05, is the null hypothesis for this interaction mean square (Ho: Interaction is significant)? Explain your answer.

3. Numbers in the cell in the following table are the means based on 8 scores for each cell.

	A
	Al	A2	A3
	B1	10	20	30
B	B2	40	50	60
	B3	50	30	10

Is the main effect of A appears to be significant? Explain your answer.

4. List the assumptions required for a factorial design ANOVA and explain each one.

5. To test some effects of layout design, participants spent the first part of an experiment reading the instructions on how to assemble a structure. The dependent variable was the number of minutes the participants spent reading the instructions before starting the assembly. The instructions were printed in small or large type with high contrast or low contrast.

		Contrast
		Low	High
	Small	3	9
		0	8
Type Size		2	7
	Large	10	11
		9	10
		8	8

Construct an ANOVA summary table of results and state your conclusions about the effects of contrast and type size on reading time. Begin by listing the dependent and independent variables in this study.