Stats 151 - Probability rules and the counting rule

Question	Answer
What is probability?	a number associate with a random event
How do you calculate AUB if the sets of data are overlapping?	P(A) + P(B) - P(AUB)
How do you calculate ANB?	P(A) * P(B) = P(A) * P(B\|A)
The mean and standard deviation of Z are always the same. What are they?	the mean is always 0 and the standard deviation is always 1
how do you calculate P(A\|B)?	number of outcomes in ANB divided by the number of outcomes in B = P(B)*P(A\|B)
kidney stones either large or small. large ones are harder to treat if 562 out of 700 treatments are successful what is the estimated success rate?	562/700*100% = 80%
what is the success rate of small stones if there are 315 small successes?	P(S\|small size) = 315/357(total small)*100% = 88%
three runners are competing for first place. how many ways can u win first? second? this is the counting rule	first = 3 ways second = 2 ways 3*2 = 6 posibilities
what are the other two ways to calculate the counting rule?	permutation = N!/(N-n)! combination = N!/n!(N-n)!

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	Created by jennabarnes12387 almost 11 years ago