Standard Deviation: Learn for Chemistry Lab Quiz

AI Thread Summary
A student preparing for a chemistry lab quiz on standard deviation expressed confusion about the formula and its application. After receiving a helpful link, they later found the concept easier than initially thought after consulting their lab teacher. The discussion shifted to challenges with gas stoichiometry and the tendency to forget previously learned material, even with high exam scores. The student is seeking additional resources for gas stoichiometry and plans to post quiz questions for further assistance. The conversation highlights common struggles in retaining chemistry concepts throughout the semester.
sportsstar469
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i would post this in the chem section but more people view this one..

im having a quiz on standard deviation in chemistry lab onf riday, and I am not sure AT ALL how to do this. i tried asking the teacher but he's not to good at explaining. and i tried lookinga t the difficult to understand book on this.
 
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Do you not know the formula or do you know the formula but not know how to use it? If the latter, what part specifically are you having trouble with?
 
DaleSpam said:
Do you not know the formula or do you know the formula but not know how to use it? If the latter, what part specifically are you having trouble with?

nope i don't know ANYTHING. i ssaw the formula in class but was still confused b ut i don't even know the formula now i lost the note for it.
 
This will get you started. This is the definition of the mean-squared deviation for n measurements:
http://www.xycoon.com/mean1.htm
The rms (or root mean squared) deviation is the square root of this.
Bob S.
 
Bob S said:
This will get you started. This is the definition of the mean-squared deviation for n measurements:
http://www.xycoon.com/mean1.htm
The rms (or root mean squared) deviation is the square root of this.
Bob S.

thanks for the link bob!
but it was really easy, i asked my lab teacher today i can't believe i thought it was hard.

now if only i could do the gas stoichiometry in ideal gas equations...
i have been dealing with stoichiometry the entire semester, yet, i always forget things that ci ysed to know. for instance this is a 15 week semester, we are in week 14. i have been getting the highest grades on all the exams(its a gen chem 1 class) anyway, my teacher will be like, this unit will be easy for you, its just like limiting reagnt problems, and ill be like, oh i forgot how to do those (event hough we did them 2 weeks ago)
i8 had a quiz today and i forgot how to use molarity even..

when i get the quiz back ill probably post the question on here. does anybody have a good site to look at gas stoichiometry explanations? has anybody ever heard of students forgetting the materials so quickly.
 
We do have a chemistry forum here. (hint, hint :smile:)
 
sportsstar469 said:
thanks for the link bob!
but it was really easy, i asked my lab teacher today i can't believe i thought it was hard.

now if only i could do the gas stoichiometry in ideal gas equations...
i have been dealing with stoichiometry the entire semester, yet, i always forget things that ci ysed to know. for instance this is a 15 week semester, we are in week 14. i have been getting the highest grades on all the exams(its a gen chem 1 class) anyway, my teacher will be like, this unit will be easy for you, its just like limiting reagnt problems, and ill be like, oh i forgot how to do those (event hough we did them 2 weeks ago)
i8 had a quiz today and i forgot how to use molarity even..

when i get the quiz back ill probably post the question on here. does anybody have a good site to look at gas stoichiometry explanations? has anybody ever heard of students forgetting the materials so quickly.

jtbell said:
We do have a chemistry forum here. (hint, hint :smile:)
if i have any more questions ill post them there ;). any opinions on te paragraph i just quoted in your experience?s
 
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