On a regular spring time a lot of tulip flower fields outside the Keukenhof are headed (taking the flower off) on the 30th of April or within a couple of days after it. If you want to see the flower fields as well make sure that you visit before this date!
In factorial designs, a factor is a major independent variable. In this example we have two factors: time in instruction and setting. A level is a subdivision of a factor. In this example, time in instruction has two levels and setting has two levels. Sometimes we depict a factorial design with a numbering notation.
One factor is. the amount of variation (or differences in magnitudes) in the population. A second factor is the. size of the sample. Sample size can be adjusted to reduce sampling error and obtain a desired level of precision. There is, of course, a trade-off in the cost of the study when sample size is increased.