Plants grow naturally towards the strongest source of light, this is called phototropism. They do this in order to maximise their exposure to the sun and increase the amount of photosysnthesis (and therefore growth). This is a survival mechansim.
researcher will either use random assignment or matching What do random assignment and matching have in common? They are both designed to create equivalent groups of participants. Random assignment is to random selection as _____ is to _____
Stratified and cluster sampling both attempt to deal with problems with simple random sampling. The first problem is that, while a simple random sample may technically be unbiased, it may not be representative. For example, suppose my population comprises two men and two women and a sample of size two is required.