You would be sampling units 4, 9, 14, 19, and so on to 100 and you would wind up with 20 units in your sample. In order for systematic sampling to work, it is essential that the units in the population be randomly ordered, at least with respect to the characteristics you are measuring.owever, if the goal is to learn about a large population, it is imperative to avoid judgment of nonprobabalistic samples in survey research. [Salant, p64] In contrast to probability sampling techniques, there is no way of knowing the accuracy of a non-probabilistic sample estimate.
Gender is another factor in resting heart rate norms because women at various fitness levels tend to. have higher pulse rates on average than men of comparable fitness levels. For example, the average. resting heart rate of an elite 30-year-old female athlete ranges from 54-59 beats per minute, while the. resting heart rate for men of the same age and fitness level ranges from 49-54.1. Keep in mind that many factors can influence heart rate, including:
A womanâs maximum heart rate is 225 heartbeats per minute minus her age; a manâs is 220 heartbeats per minute minus age. Consequently, a 40-year-old woman should have an exercise heart rate of 111 to 157 heartbeats per minute, while a 40-year-old manâs should be 108 to 153. A 60-year-old womanâs exercise heart rate should be 99 to 140 heartbeats per minute while a 60-year-old manâs should be 96 to 136.