formula quiz 8
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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random variable | is a variable whose value is a numerical outcome of a random phenomenon. there are two types of random variables (discrete and continous)
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a discrete random variable | is a random variable which takes on only a finite or countable number of possible values
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a probability distribution foa rv X | tell sus what the possible values of X are and how porbabilites are assigned to those values (also called probability function)
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a continous random variable x | takes all values in an interval of numbers
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mean of a random variable is | x1p1+x2p2+xnpn
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the variance of this random variable is | sigma (xi-mu)squared pi
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the stanadrd deviation of this random variable is | the square root of the variance
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rules for means ( if x is a random variable and a and b are constants) | mua+x=a+mux, mubx=bmux, mua+bx=a+bmux, mux+y=mux+muy
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rules for variances | var (a+x)=var(x), var(bx)=bsqauredvar(x)
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var (x+y)= | var(x)+var(y)
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var(x-y)= | var(x)+var(y)
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law of large numbers | the difference between a sample proportion and a poporlation propoertion must gegt smaller as the sample size gets larger"
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