次の英文を和訳してほしいです。
The article mentions that the 50 research subjects were divided into three groups. Thus, each group likely had 16 or 17 members. With such a small sample size, the findings can only be described as preliminary. Even so, the results are very interesting because earlier studies with animals suggested that reduced-calorie diets may improve memory. This study, with its admittedly small sample, backs up the original research and makes it clear that the research should be continued. To be sure, a study done with a larger sample would seem to be the next step. Surprisingly, samples do not have to be very large in order to make accurate predictions about a population. In fact, using a sample is actually more accurate than if data on every member of a large group were collected. For one thing, with a large population, the time required to get data on each member would mean that conditions might change between the beginning of the data collection and the final analysis of the data. Another problem would be that more mistakes in entering the data would occur if too many members were surveyed. Thus, if a proper sample size is selected, and data are collected properly, an accurate prediction about a population can be made even with a relatively small sample.
