Advantages and disadvantages of the related-samples design please help me answer

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Advantages and disadvantages of the related-samples design

please help me answer this question (keep in mind there can be more than one answer) thank you so much!!!

Aa Aa E 10. Advantages and disadvantages of the related samples design Disadvantages of using a related sample (either one sample of participants with repeated measures or two matched samples) versus using two independent samples include which of the following? Check all that apply D Related samples (specifically, one sample of participants with repeated measures) require fewer participants for the same degree of power Related samples (specifically, one sample of participants with repeated measures) can have a carryover effect such that participants can learn from their first measurement and therefore do better on their second measurement. A related-samples design reduces or eliminates problems caused by individual differences such as age, IQ, gender, or personality. Related samples (specifically, one sample of participants with repeated measures) can have an order effect such that a change observed between one measurement and the next might be attributable to the order in which the measurements were taken rather than to a treatment effect.

Explanation / Answer

First option is an advantage of related samples, because each participant is taking part in all treatments, need at least half the amount of participants than if you used a between subjects design.

Second option is a disadvantage because the effect of the previous treatment carries over into the following treatment, again creating a confound.

Third option is an advantage because in a related sample study one group is exposed to both treatments, whereas for independent groups or between subjects there are two separate groups and each group is exposed to a different treatment.

Fourth option is a disadvantage of related samples, it is subject to order effects, where the participant starts to suffer from fatigue or boredom thus creating a confound.

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