Ff snel

10 important questions on Ff snel

Which type of analysis could you conduct in order to measure whether the randomisation was successful?

One-way or univariate ANOVAs.

Which type of analysis do you conduct in order to measure whether the manipulation check was successful?

Repeated measure ANOVAs or paired-sample t-tests with difference scores (overall and per group).

What are 3 reasons for meta-analysis?

1. To examine moderators and detect biases
2. To deal with information overload in a systematic way
3. To integrate findings of different studies to obtain a more reliable result and to test the robustness of an effect
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What should you be worried about when all studies included for your meta analysis show a positive effect, but have small samples?

Publication bias: there is a chance that only those studies have been published that found a signficant effect, while the studies that did not find an effect have not been published.

What is the advantage and disadvantage of contrast analyses?

- Advantage: more power
- Disadvanage: no exploration of other comparisons possibly missing an effect

What is the risk if we would do all post hoc comparisons without correction?

We would find that one intervention is more effective than treatment as usual, while this is not the case

Why conduct a manipulation check?

You want to check whether a manipulation was succesful and caused a change in the manipulated variable that did not emerge in a control condition.

The bonferonni corrected p-value is ... Than the uncorrected p-value

Larger

Why conduct a randomization check?

You want to check whether people were randomly allocated to conditions and that there were no a priori differences between the groups

Why is it necessary to include variables as covariates when that variable chances between gropus?

These variables could affect the outcomes of the study

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