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level: Level 1

Questions and Answers List

level questions: Level 1

QuestionAnswer
p(x) is greater than or equal to 0 and less than or equal to 1, for all x, and the sum off all x must be equal to 1Discrete probability distributions must satisfy:
probability densitieswhat does the y axis in a continuous distribution represent?
theoretical mean of the random variableexpected value?
the expectation of the squared distance of x from its mean = E[(x - μ)^2]variance of x = ?
the sample mean, not population meanwhat does x bar mean?
the population mean (EXPECTATION), not sample meanwhat does mew mean?
square root of variancehow to find standard deviation?
if n is large and p is small, and np stays constantwhen does a Binomial Distribution tend toward a Poisson distribution?
Hypergeometricwhich distribution is the Binomial distribution a good approximater of?