A developmental psychologist developed a training program to encourage children to reduce their Internet usage.To examine its efficacy he recruited a sample of 120 children - of whom 60 were aged 11 years and 60 were aged 13.Half of the participants were randomly assigned to the training program and the amount of online usage was measured after one month.Findings were subjected to two-way ANOVA, from which the output was as follows: Which of the following statements is true?
A)The nonsignificant main effect for age group tells us we can ignore age.
B)The nonsignificant main effect for age group tells us we can ignore age so long as our alpha level is not significant.
C)The nonsignificant main effect for age group tells us we can ignore age so long as our alpha level is less than .225.
D)Despite the nonsignificant main effect for Age this IV is still relevant because it is implicated in a significant interaction effect.
E)Age is relevant because maturation effects may lead to central limits on randomization.

Question

A developmental psychologist developed a training program to encourage children to reduce their Internet usage.To examine its efficacy he recruited a sample of 120 children - of whom 60 were aged 11 years and 60 were aged 13.Half of the participants were randomly assigned to the training program and the amount of online usage was measured after one month.Findings were subjected to two-way ANOVA, from which the output was as follows:  Which of the following statements is true?
A)The nonsignificant main effect for age group tells us we can ignore age. 
B)The nonsignificant main effect for age group tells us we can ignore age so long as our alpha level is not significant. 
C)The nonsignificant main effect for age group tells us we can ignore age so long as our alpha level is less than .225. 
D)Despite the nonsignificant main effect for Age this IV is still relevant because it is implicated in a significant interaction effect. 
E)Age is relevant because maturation effects may lead to central limits on randomization.

Quizplus · Accepted Answer

The nonsignificant main effect for Age does not imply that we can ignore age completely. Instead, it suggests that there is no significant difference in online usage between the 11-year-olds and 13-year-olds overall. However, the significant interaction effect suggests that the training program's efficacy may depend on age group. Therefore, Age is still relevant as an IV.

A Developmental Psychologist Developed a Training Program to Encourage Children