Question

A researcher records the amount of time (in minutes) that parent-child pairs spent on social networking sites to test whether they show any generational differences. From the following findings reported in APA format, interpret these results.

Parents spent significantly less time on social networking sites compared to their children

(M_D = 42 minutes),

t(29) = 3.225,

p < 0.05,

d = 0.75.

State the research design used (repeated measures or matched pairs).

-repeated measures design

-matched pairs design   

State the sample size.
_______ participants

State the decision to retain or reject the null hypothesis.

-Retain the null hypothesis.

-Reject the null hypothesis.   

State the effect size.

-small

-medium    

-large

Answer 1

Given that, MD = 42 minutes

Test statistic = t(29) = 3.225

p-value = p < 0.05

Effect size = d = 0.75

The research design used is matched pairs design.

Sample = 29 + 1 = 30

=> 30 participants.

Since, p-value is less than 0.05, we Reject the null hypothesis.

Since, effect size = d = 0.75 is lies between 0.2 to 0.8, we can say that this effect size is medium.

Note :

i) if, 0 < d < 0.2 then effect size is small.

ii) if, 0.2 < d < 0.8 then effect size is medium.

iii) if, d > 0.8 then effect size is large.