Stratified sampling:
- Divide the population into strata based on relevant characteristics
- Select a sample from each stratum using the same proportions as the population
Random-stratified:
- Divide the population into strata based on relevant characteristics
- Randomly select a sample from each stratum using the same proportions as the population
E.g. There's 300 people in my population and I divide them into 3 strata based on eye colour - brown (100 people), green (100 people) and blue (100 people). I want a sample of 30, so I would need 10 people from each stratum so that the proportions are the same. Using stratified sampling, I would just pick the first 10 from each stratum without any attempt to make sure that everyone has an equal chance. Using random-stratified, I would assign each person a number and then randomly select my 10 using a random number generator or something.
Thank you!! even tho i didnt ask the question your answer clarified my thoughts!
hi guys would someone mind clarifying developmental and adaptive plasticity for me. I always seem to get confused. like with developmental plasticity is it only during childhood? and with the adaptive is it only when we experience damage to the brain?
thank you.
Hope everyone smashed English!!
Not entirely correct, yes developmental plasticity is more extensive throughout childhood and generally diminishes with age, but adaptive plasticity is ALSO more extensive, substantial and quicker during childhood, the difference here is that developmental refers to maturation, synaptogenisis and synaptic pruning and, once again, diminishes with age, whereas adaptive refers to changes in neural structures to adapt/compensate for brain damage and can occur during any time in our lifespan.
Basically just be cautious when saying "only" cause that limits your answer and could cost you a mark. So say 'generally' for a more accurate answer (ironic)
Also just a quick tip my teacher taught me, when you're uncertain in a mc question, avoid circling the ones that use "always" or "only" because they're normally are trying to throw you off by sounding right, but the word "only" or "always" makes the option wrong, if that makes sense? This tip has saved me in SO many trials, so i really trust it!
hope that helped