A researcher records the amount of time (in minutes) that parent-child pairs spe

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

(MD = 42 minutes), t(29) = 3.214, p < 0.05, d = 0.58.

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

-repeated measures design

-matched pairs design   

b) State the sample size:
_____ participants

c) State the decision to retain or reject the null hypothesis:

-Retain the null hypothesis.
-Reject the null hypothesis.  

d) State the effect size:

small
medium    
large

Explanation / Answer

a) There is pair as parents and their child so this is the matched pairs design.

b) The given degrees of freedom = df = n - 1 = 29

so than n = 30

there are 30 participants.

c)

Decision rule: 1) If p-value <= level of significance (alpha) then we reject null hypothesis

2) If p-value > level of significance (alpha) then we fail to reject null hypothesis.

Here p value < 0.05 so we used first rule.

That is we reject null hypothesis  

effect size = d = 0.58 which is close to 0.5 so correct choice is effect size = medium.

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