Stat Test Notes

Stat Test Notes - Psych 10 Statistics 60 Test Notes Week 1...

This preview shows pages 1–2. Sign up to view the full content.

Week 1 - Univariate Frequency Distribution o Make a table with f i , rf i = f i /N, E i = N/k o To describe location, use Mode o To describe dispersion, use rf at Mode - χ2 Tests : Goodness of Fit o χ 2 =Σ (O i -E i ) 2 / E i df = k-1 - χ2 Tests: Tests of Independence o Same χ2 as above, but df = (r-1)(c-1) o E ij = R i * C j / N - Explanation o State the precise relationship between the two factors, namely, that X are more likely to do Y o Describe the overall distribution of each variable (w/ the mode and its relative frequency) Week 2 - Necessary Sample Size o Perform a χ 2 with O i and E i values in prob. Form and multiplied by N - Probability o Addition Rule p(A or B) = p(A) + p(B) – p(A and B) o Multiplication Rule for Indep. Events p(A and B) = p(B)*p(A) o Bayes’ Rule p(A|B) = p(A and B) / p(B) Note: p(A and B) = p(A|B) * p(B) - Reminders o Make a Table o Take into account “gets exactly 1 question right out of 4” = 4 ways to do this Week 3 - rf- and rcf-histograms for grouped data o Set-Up Make a table with rf i , rcf i, real interval, midpoints x-bar Real interval is initial interval +/- .5 on either end. X u = Upper Limit Value Rcf u = Upper limit rcf P = Desired proportion Rf c = Relative frequency of interval W c = Width of Interval o X p = X u – [(rcf u – p) / rf c ] * W

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 4

Stat Test Notes - Psych 10 Statistics 60 Test Notes Week 1...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online