Hi again!
1. I was wondering what the difference between matched pair test and 2-sample mean test is.
If we get the questions, how do we distinguish one another?
I thought the matched pair questions only have one population (which the pairs come from) while 2-sample mean questions have two different population. Is it correct?
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it is very distinct - there are two columns of data, but matched pairs have a single subject in common. i.e. subject 1 has left and right measurements, subject 2 has before and after numbers... etc.
2 sample tests have two columns of data too but there are no common subjects! :)
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2. When solving FRQ, when do we have to specifically give out most of our 풀이 and when do we don't have to?
When the question says "conduct an appropriate test blah blah" can I just give out the essential information I've got through calculator without writing all the 풀이과정?
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generally, the answers are very formatted. tests must involve:
1. name of the test & hypotheses
2. conditions are met?
3. mechanics (pvalue calculation)
4. conclusion
you should also just make it a rule to be as verbose as you can without being redundant or unclear.
and if you don't write the formulas and 풀이과정 you may lose out on the partial credits!
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3. Does AP Stat has a non-calculator section? like the one in Ap calc?
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nope. don't worry :)
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4. When determining sample size n from the ME and C, the handout says "p hat is unknown! use p hat = 0.5"
this only applies when we don't know p hat right? if the p hat is given from the question, we have to use the given value right?
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if you think about it a bit, if you knew the population proportion you don't need to do a survey :)
so most likely you will have to use 0.5
if it is given that a previous survey had such and such results, or the population proportion is believed to be such and such, then use that. otherwise just use 0.5
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Sorry all the questions are messed up and clumped.
And thanks in advance !
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no probs! it was very legible
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