Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

The fourth study did provide the effect size estimation, but the sample size calculated in the paper deviated from that calculated using the standard formula by 6% ... Sample sizes in COVID-19–related ...

Timely research requires smaller sample sizes or rapid sampling of larger numbers of subjects. The trade-off means qualitative data from fewer people or less data collected from a larger sample.

Serious questions have been raised about the integrity and validity of research performed by a well-established German stem cell research group. A paper published in the International Journal of ...

Detailed information on Pew Research Center international survey methodology, such as mode of interview, sampling design, ... (CAPI), but historically pen-and-paper interviewing (PAPI) was used in ...

What do the numbers seven, nine, 11, 25 and 150 have in common? They may feel familiar since they frequently pop up in business articles.