Statistics & Research MethodsANOVA or F Test (CBSENET (UGC) Psychology (PaperII & PaperIII)): Questions 1  6 of 9
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Question number: 1
» Statistics & Research Methods » ANOVA or F Test
Appeared in Year: 2013
Question
What would be the degrees of freedom for error variance in a five group randomized ANOVA, with twelve subjects per group? (December)
Choices
Choice (4)  Response  

a.  60 

b.  55 

c.  54 

d.  59 

Passage
A researcher wanted to study the effect of a specific drug on the activity of rats. He suspected if the effect of the drug is moderated by temperature. He varied drug dosage (A) at three levelsno drug (placebo), low drug dosage (5 mg/kg bodyweight) and high drug dosage (10 mg/kg bodyweight). He varied temperature (B) at two levels  25 degree Celsius and 39 degree Celsius. Fifteen rats were randomly assigned to each of the six groups. The activity scores for each rate were obtained through activity wheel. The cell means and standard deviations for activity scores were obtained for the six cells. All the cells had comparable standard deviations. A suitable analysis of variance was carried out using the activity scores as the dependent variable. One of the interesting finding in this research was that the F ratio defined as “MSA B/MSE” was statistically significant at. 01 level.
(June 2014)
Question number: 2 (1 of 1 Based on Passage) Show Passage
» Statistics & Research Methods » ANOVA or F Test
Appeared in Year: 2014
Question
From the above paragraph, it can be inferred that the assumption of homogeneity of variance
Choices
Choice (4)  Response  

a.  suggests square root transformation of data in this case. 

b.  cannot be evaluated in the absence of relevant data 

c.  has been violated 

d.  has been satisfied 

Passage
A researcher wanted to study the effect of a specific drug on the activity of rats. He suspected if the effect of the drug is moderated by temperature. He varied drug dosage (A) at three levelsno drug (placebo), low drug dosage (5 mg/kg bodyweight) and high drug dosage (10 mg/kg bodyweight). He varied temperature (B) at two levels – 25 degree Celsius and 39 degree Celsius. Fifteen rats were randomly assigned to each of the six groups. The activity scores for each rate were obtained through activity wheel. The cell means and standard deviations for activity scores were obtained for the six cells. All the cells had comparable standard deviations. A suitable analysis of variance was carried out using the activity scores as the dependent variable. One of the interesting finding in this research was that the F ratio defined as ‘MSA B/MSE’ was statistically significant at. 01 level.
(June 2014)
Question number: 3 (1 of 4 Based on Passage) Show Passage
» Statistics & Research Methods » ANOVA or F Test
Question
From the significant F ratio, ‘MSA B/MSE’, it can be inferred that
Choices
Choice (4)  Response  

a.  the main effect of drug dosage is significant 

b.  the main effect of temperature is significant 

c.  the effect of drug dosage is moderated by temperature 

d.  the main effect of drug dosage, the main effect of temperature, and the interaction effect of the two, all are significant. 

Question number: 4 (2 of 4 Based on Passage) Show Passage
» Statistics & Research Methods » ANOVA or F Test
Appeared in Year: 2014
Question
What would be the degrees of freedom for error variance?
(June)
Choices
Choice (4)  Response  

a.  90 

b.  89 

c.  84 

d.  83 

Question number: 5 (3 of 4 Based on Passage) Show Passage
» Statistics & Research Methods » ANOVA or F Test
Question
What would be the degrees of freedom for the interaction term?
Choices
Choice (4)  Response  

a.  2 

b.  3 

c.  5 

d.  6 

Question number: 6 (4 of 4 Based on Passage) Show Passage
» Statistics & Research Methods » ANOVA or F Test
Question
Since the F ratio, defined as ‘MSA B/MSE’, is significant, it would be desirable to carry out
Choices
Choice (4)  Response  

a.  posthoc comparisons for the three levels of A 

b.  compute 3 2 multivariate ANOVA 

c.  posthoc comparison for the two levels of B. 

d.  simple effects analysis 
