I have three problems Ineed to solve for HW; each has two categories (male/femal

Question

I have three problems Ineed to solve for HW; each has two categories (male/female, etc)and a certain known number of samples (some problems this isn't thesame), I can thus find the mean of both sides in each problem easy;I can also find the standard deviation of the data in bothcategories; in one question this is just given actually.

in one question, I'm givenan alpha value to use, another one, it's a 2% level ofsignificance; the first one I'm not told anything so I guess it'sup to me.

In one question, itsasking if the mean is 4 greater in one; in the next, based on themean value, we'll decide which product to buy; in the last one, Ineed to find a variance of test scores (I don't know what unitsvariance should go in, btw...)

I think these all use theexact same principal; unless the last one the difference invariance is relating to something else; can anyone link me tosomewhere where there's a formula for just two sets of data,comparing the means based on the individual means, standarddeviations, and number of samples based on a certain level ofsignificance? Thanks!~

Explanation / Answer

So first of all with the one that alpha isn't given, use 5%.Thats a standard, you always use 5% unless told otherwise. And the unit of variance is the same as the units on the restof the problem. http://www.duxbury.com/statistics_d/templates/student_resources/0534377556_woodbury/artfinal/Formulas/Formula%205.jpg the first formula is the one that you should use if they giveyou . If they give you a data set, or s, use thesecond. please rate.

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