level: Level 1
Questions and Answers List
level questions: Level 1
| Question | Answer |
|---|---|
| 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 1 | Discrete probability distributions must satisfy: |
| probability densities | what does the y axis in a continuous distribution represent? |
| theoretical mean of the random variable | expected value? |
| the expectation of the squared distance of x from its mean = E[(x - μ)^2] | variance of x = ? |
| the sample mean, not population mean | what does x bar mean? |
| the population mean (EXPECTATION), not sample mean | what does mew mean? |
| square root of variance | how to find standard deviation? |
| if n is large and p is small, and np stays constant | when does a Binomial Distribution tend toward a Poisson distribution? |
| Hypergeometric | which distribution is the Binomial distribution a good approximater of? |