2007-04-18 03:49:54 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Suppose your population can be divided into distinct (no overlap) groups, by age for example, 40% age 1-20, 30% age 21-40, 20% age 41-60, 10% age 61-100. Then you make your sample 40% age 1-20, 30% age 21-40, and so on.
2007-04-18 03:57:16 · answer #1 · answered by Philo 7 · 0⤊ 0⤋
You would use if if you want to "control" for a certain variable in statistical samples. For example you might stratify by gender into male and female and sample from those 2 groups. Or you might stratify by age and then sample from those groups.
2007-04-18 03:58:25 · answer #2 · answered by ewtaylor2001 5 · 0⤊ 0⤋
stratified sampling is a way of selecting samples
"the process of grouping members of the population into relatively homogeneous subgroups before sampling"
2007-04-18 03:54:11 · answer #3 · answered by Anonymous · 0⤊ 0⤋
a)she doesnt randomly select her participants so if the nerds had a faster reaction times she could have picked all the nerds to have better results b)She could take an equal amount of people randomly with equal amounts of girls and boys ex. 5 boys 5 girls
2016-05-18 00:20:10 · answer #4 · answered by ? 3 · 0⤊ 0⤋