Random variables and discrete probability distributions
11 important questions on Random variables and discrete probability distributions
On what 2 variables is the normal distribution based?
2. The standard deviation sigma. If it increases, the curve becomes flatter and wider, and vice versa
What is a stochastic variable?
What are the 6 steps to find the interval probability using a normal distribution?
2. Write down values mu, sigma and X
3. Draw normal distribution, and indicate mean and X value
4. Calculate Z-value using the formula: (X-mu)/sigma
5. Look up which percentage corresponds to Z-value
6. What is asked, smaller (left) or larger (right) of certain value
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When do you use an exponential distribution?
What are the symbols in an exponential distribution?
2. e - set value
3. x - value with which you want to calculate
What is the exponential distribution calculating rule?
What is a t-distribution?
What are the symbols in a t-distribution?
2. V = variance
3. df = amount of degrees of freedom
What is a chi-squared distribution (x^2-distribution)?
E(x^2) = df
V(x^2) = 2 x df
How do you call a function that assigns a numerical value to each simple event in a sample space?
How do you call a table, formula, or graph that describes the values of a random variable and the probability associated with these values?
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