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 large number of degrees of freedom associated with the error term is a cause for concern.
B)The large number of degrees of freedom associated with the error term is only a cause for concern is the assumption of homogeneity of regression to the mean is violated.
C)The assumption of independence is irrelevant here because the researcher used randomization.
D)The effect for condition is of medium size by Cohen's standards.
E)The probability of randomly sampling a difference of this size is .001.

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 large number of degrees of freedom associated with the error term is a cause for concern. 
B)The large number of degrees of freedom associated with the error term is only a cause for concern is the assumption of homogeneity of regression to the mean is violated. 
C)The assumption of independence is irrelevant here because the researcher used randomization. 
D)The effect for condition is of medium size by Cohen's standards. 
E)The probability of randomly sampling a difference of this size is .001.

Quizplus · Accepted Answer

According to the output, the effect size for condition (partial eta squared) is 0.087, which is considered a medium effect according to Cohen's standards. None of the other options are supported by the information given in the question.

A Developmental Psychologist Developed a Training Program to Encourage Children