Does Sample Size Affect Reliability Or Validity. With a random sample of sufficient size research findings can generalize to the larger population. Several methods for assessing the similarity between a sample and population currently exist as well as methods estimating the PATE.
Dec 02 2011 i conclude that not just sample size will determine validity of a study. The reliability and validity of your results depends on creating a strong research design choosing. Validity estimates were stable in samples of n 80 for 75 of scales in samples of n 40 and for 50 of scales in samples of n 20.
Good internal validity is insured by application of the concept of control.
A small sample size affects the reliability of a surveys results because it leads to a higher variability which may lead to bias. I would argue that a multi-cultural sample including different nationalities and religions with less participants would be a more generalizable than a larger sample from one nation and culture. Mar 13 2018 Effects of Small Sample Size In the formula the sample size is directly proportional to Z-score and inversely proportional to the margin of error. In this study sample sizes of a minimum of 20 for reliability and 80 for validity provided estimates highly representative of the main study.
