Statistics homework help

/in /by

Educational Psychology 565 Practice Quiz
 
 
(use α = .05 unless otherwise stated).
 
 
 

  1. A small school district wants to know what type of teaching/learning is most effective at helping students learn to read. Three methods are proposed (top-down, bottom-up, and interactive). It is believed that the gender of the teacher may also be important in student learning, so the study also aims to determine if gender of the teacher is important. There are 12 schools in the district, and each school has 1 second grade class (each class has 10 students). Two female teachers and two male teachers’ classrooms are randomly assigned to each of the three methods (all 12 teachers have just been hired in the district). At the end of the year, the students all took a 100 item standardized multiple-choice reading test called the “EZreading” test (note: the analysis was performed at the student level).

 
Coding:
teachgender = gender of teacher: 1= men, 2 = women
Teachmeth = teaching method (1=top-down, 2=bottom-up, 3=interactive)
EZread = scores on the Ezread reading test
 
Use SPSS output “SPSS printout for question 1”to help answer the parts below.
 

  1. What is/are the independent variable(s) in this experiment (Be specific)? What level of measurement is/are the IV(s)? Explain why?

 
 
 
 
 

  1. What is/are the dependent variable(s) in this experiment (Be specific)? What level of measurement is/are the DV(s)? Explain why?

 
 
 
 
 
 

  1. State the null hypotheses and alternative hypotheses for the factors and the interaction in symbols and words.

 
 
 
 
 

  1. Do you think the assumption of homogeneity of variance has been met? Support your answer.

 
 
 
 
 

  1. Do you think the assumption of independence has been met? Support your answer.

 
 
 
 
 

  1. Calculate Cohen’s d for the difference between the top-down and interactive methods. Explain what Cohen’s d means for this comparison.

 
 
 
 
 

  1. Is the interaction of the two factors statistically significant? Explain your answer.

 
 
 
 
 

  1. Report the results of the study along with an interpretation for the results. You do not need to write up the results like a results section; you can just report the findings with statements about each factor and the interaction of the two factors. Be sure to cite evidence from your analysis.

 
 
 
 
 
 
 

  1. Based on the results of the study what would you recommend about teaching method and gender of teachers?

 
 
 
 
 
 
 

  1. Answer the following questions.

 

Source SS df MS F
Between 100   20  
Within   2 50  
Total 200 7    

 

  1. Complete the ANOVA source table (fill in all blank spaces)
  2. How many people are in this study. (hint: use degrees of freedom)

 
 
 
 
 
 
 
 
 
 
 

  1. What is the critical F at α = .01? Would you reject the null hypothesis? Explain your answer.

 
 
 
 
 

  1. What are the critical F at α = .05? Would you reject the null hypothesis? Explain your answer.

 
 
 
 
 

  1. Why do the conclusions from items c and d differ? Explain your answer in terms of Type I and II errors.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

  1. A researcher wants to know whether there are differences between two teaching techniques and baseline in improving math skills. Due to economic considerations he could not use a between-subjects design. Therefore, he measured participants’ math skills at baseline, gave them teaching method A for two weeks and measured their math skills, and then gave them teaching method B for two weeks and measured their math skills. On the measure low scores indicated low math skills. Using the provided SPPS output to answer the following questions:

 

  1. Was the assumption of sphericity met? Explain your answer.

 
 
 
 

  1. According to the omnibus test was there a difference between baseline and/or the methods. Explain your answer.

 
 
 
 

  1. Using the output from the pairwise comparisons. Explain which levels of the within-subjects factor differ.

 
 
 
 
 

  1. What is the primary weakness of this design?

 
SPSS printout for question 1.
 
 
 

  1. Teachmeth

 
 

  1. Teachgender

 
 
 
 
 

  1. Teachmeth * Teachgender

 
 
 
 
 
 
 
 
 
 
 
SPSS printout for question 3.