By: alexedgar • 2 months ago
Just glancing through at the moment. Looks concise and thorough.
Some examples from this set of practice questions
1.
Formula: Effect size for comparing means
Answer: Effect size (d) = Mean difference / Standard deviation = (x̅ - μ) / σ
2.
Formula: Calculation of the probability of event (E) occurrence
Answer: p(E) = Number of favourable events (occurrence) / Number of possible outcomes
3.
Formula: The probability of an event (E) NOT occurring
Answer: p(not E) = 1-p(E)
4.
Formula: Combining probabilities - Additive Rule (Mutually exclusive events)
Answer: p(A or B) = p(A) + p(B)
5.
Formula: Combining probabilities - Multiplicative Rule (Independent Events)
Answer: p(A and B) = p(A) x p(B)
6.
Formula: Binominal Distribution
Answer: P(x) = [n! / x! (n-x)!][Px(1-p)n-x] *x = the probability of the number of successes to be determined for a random variable *n = the number of trials *p = the probability associated with any single, independent outcome of the variable **Note: n-x is a superscript
7.
Formula: Z-Test
Answer: z = (x - µ) / σ *x = variable *μ = population mean *σ = standard deviation [SD]
8.
Formula: Sample Error
Answer: σx̅ = σ / √n *σx̅ = standard error *σ = population standard deviation *√n = Sample size
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