Standard Deviation: Learn for Chemistry Lab Quiz

[sportsstar469]

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.

 

[Dale]

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?

 

[sportsstar469]

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.

 

[Bob S]

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.

 

[sportsstar469]

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.

 

[jtbell]

We do have a chemistry forum here. (hint, hint )

 

[sportsstar469]

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 )

if i have any more questions ill post them there ;). any opinions on te paragraph i just quoted in your experience?s