BUAL 2650 Yan LATEST UPDATED 2025/2026 Exam 2 WITH COMPLETE Questions & SURE VERIFIED SOLUTIONS 100% GRADED AT A+ SCORE!!

BUAL 2650 Yan LATEST UPDATED 2025/2026 Exam 2 WITH COMPLETE Questions & SURE VERIFIED SOLUTIONS 100% GRADED AT A+ SCORE!! 1. what are matched pairs? - ANSWER aka matched samples, they are paired up so that the participants share every characteristic except for the one under investigation 2. If p 0.10 - ANSWER there is SOME evidence to reject H0 3. If p 0.05 - ANSWER there is STRONG evidence to reject H0 4. If p 0.01 - ANSWER there is VERY STRONG evidence to reject H0 5. if p 0.001 - ANSWER there is EXTREMELY STRONG evidence to reject H0 6. dependent (response) variable - ANSWER variable we wish to understand/ predict 7. independent (predictor) variable - ANSWER the variable we will use to understand or predict the dependent variable 8. regression analysis - ANSWER a statistical technique that uses the observed data to relate the dependent variable to one or more independent variables 9. B0 - ANSWER the Y-INTERCEPT 10. B1 - ANSWER the SLOPE 11. E (epsilon) - ANSWER an error term that describes the effect on y of all factors other than x 12. Uy = B0 + B1*X+ E - ANSWER the mean value of the dependent variable y when the value of the independent variable is x 13. In testing the difference between the means of two normally distributed populations using independent random samples with equal variances, the correct test statistic to use is the _________ - ANSWER T-test 14. when testing a hypothesis about the mean of a population of paired differences in which two different observations are taken on the same units, the correct test statistic to use is ______ - ANSWER t 15. when testing the difference between 2 population proportions using large independent random samples, the _______ test statistic is used - ANSWER z 16. if we are testing the hypothesis about the mean of a population of paired differences with samples of n1=10, n2=10, the degrees of freedom for the t-statistic is _______ - ANSWER 9 17. D0 - ANSWER a number whose value varies depending on the situation. Often D0 will be the number 0 18. Assumptions for t-test statistic - ANSWER - independent samples - equal variances - either normal populations OR large sample sizes 19. paired differences experiment - ANSWER an experiment in which we have obtained 2 different measurements on the same "n" units is called ________ 20. ud (mu d) - ANSWER the mean of population of paired differences 21. r^2 - ANSWER - simple coefficient of determination - proportion of the total variation explained by the overall regression model - r^2 = [0, 1] - r^2= explained variation/ total variation 22. SSR - ANSWER explained variation 23. SSE - ANSWER unexplained variation - sum of squares due to error 24. Total variation - ANSWER the sum of explained and unexplained variation 25. r - ANSWER - r = +sqrt(r^2) if b1 is positive - r = - sqrt(r^2) if b1 is negative - r = [-1, 1] 26. mean of zero - ANSWER at any given value of x, the population of potential error term values has a mean equal to zero 27. Constant Variance Assumption - ANSWER at any value of x, the population of potential error term values has a variance that does not depend on the value of x 28. Normality Distribution - ANSWER at any given value of x, the population of potential error term values has a normal distribution 29. Independence Assumption - ANSWER any one value of the error term E (epsilon) is statistically independent of any other value of E 30. Mean square error (s^2) - ANSWER MSE = SSE/ (n-2) - point estimate of the residual variance o^2 (sigma ^2) 31. ANOVA table - ANSWER - used to summarize the results of the F-test for significance in regression 32. Simple linear regression model - ANSWER Y= B0 + B1*X1 + E 33. Multiple linear regression model - ANSWER Y= B0 + B1*X1 + B2*X2 + B3*X3 + ... + BkXk + E 34. Simple Linear Regression Equation - ANSWER y-hat = b0 +b1*x 35. Multiple linear regression equation - ANSWER y-hat = b0 + b1*x1 + b2*x2 + ... + bk*xk