help?

Question

help?

anonymous · Answer

An opinion research company wants to determine the opinions of a city on a proposed extension of a light rail system. The company wants its results to accurately reflect the opinions of four different age groups. 

Which type of sampling strategy is best suited for this purpose?
 
 A.
convenience
 
 B.
simple random
 
 C.
stratified random
 
 D.
systematic

jim_thompson5910 · Answer

check out this page http://stattrek.com/statistics/dictionary.aspx?definition=strata

anonymous · Answer

help

anonymous · Answer

@Dodgegirl

anonymous · Answer

Listen to @jim_thompson5910

anonymous · Answer

did not help

anonymous · Answer

It has to..

jim_thompson5910 · Answer

The answer is basically given to you at this point. Please don't be rude

anonymous · Answer

im sorry i am not trying to be rude i just dont get it

anonymous · Answer

Plus direct answers aren't aloud here

anonymous · Answer

im not trying to get a detect answer i need to know how i solve it

anonymous · Answer

direct

jim_thompson5910 · Answer

that page I gave you basically says 

"if you have a population, you can split it up into groups aka strata"

so for example, if you want to test the difference between men and women, you'd have 2 strata.

anonymous · Answer

ok i get that but can you help me solve it

anonymous · Answer

@jim_thompson5910

jim_thompson5910 · Answer

so which do you think is the answer? and why?

jim_thompson5910 · Answer

or which do you think you can eliminate?

anonymous · Answer

@jim_thompson5910 i think b

jim_thompson5910 · Answer

if you pick people at random, how do you guarantee to have 4 different age groups?

anonymous · Answer

@jim_thompson5910  D

jim_thompson5910 · Answer

what does "systematic" mean in terms of stats?

anonymous · Answer

idk

jim_thompson5910 · Answer

this page might help https://people.richland.edu/james/lecture/m170/ch01-not.html if you scroll to the bottom of the page, you'll get to what I'm referring to (see the attached image)

anonymous · Answer

so it is d @jim_thompson5910

anonymous · Answer

because there needs to be 4

jim_thompson5910 · Answer

did you read the link I posted? scroll to the bottom of the page

anonymous · Answer

yes

jim_thompson5910 · Answer

read the "Systematic sampling" one again

jim_thompson5910 · Answer

btw it's a coincidence they're using 4 (and we have 4 groups). The two '4's have nothing in common