Edexcel Maths As Statistics Study Guide Questions And Correct Answers

Census {Ans: Every member of the population}Binomial P(x > y) {Ans: 1- P(x Why don't we rely on extrapolated values {Ans: They're an unreliable estimate}Mean in frequency tables {Ans: sum (frequency * data value) / sum (frequency * midpoint)}Binomial P(x >/= y) {Ans: 1 - P(x Venn diagrams u {Ans: Union}What 4 things are required for Binomial distributions? {Ans: 1. Fixed number of trials 2. Independent trials 3. 2 possible outcomes 4. Fixed probability of success and failure}What is the PMCC value between? {Ans: -1 < x < 1}Residuals {Ans: Distance from point to line}y = ax^n {Ans: logy = loga + nlogx}When is zero correlation used? {Ans: To prove a statistically significant PMCC}Venn diagrams ' {Ans: Complement}Independent calculation {Ans: P(A n B) = P(A) * P(B) P(A | B) = P(A)}Correlation in y = a + bx {Ans: Increase of a in x, y increases by b}Standard deviation equation {Ans: }PMCC using Sxx, Syy, Sxy {Ans: Sxy / Square root (Sxx * Syy)}What does r = -1 show? {Ans: Perfect negative correlation}What does accepting the null mean?