STT 231 ACTUAL EXAM 3 QUESTIONS AND CORRECT ANSWERS LATEST UPDATE 2026/2027 GRADED A+ .

1. first condition of hypothesistest CORRECT ANSWER 10successes/failures 2. second condition of hypothesis test CORRECT ANSWER independence of data points 3. if value is contained in interval CORRECT ANSWER accept null, p-val greater than significance level 4. if value NOT contained in interval CORRECT ANSWER reject null, p-val smaller than significance level 5. chi sq goodness of fit CORRECT ANSWER 1 categorical variable follows proposed distribution 6. chisq center CORRECT ANSWER df 7. df CORRECT ANSWER (rows-1)(columns-1) 8. chi sq intependence test CORRECT ANSWER 2 categorical variables 9. expected count CORRECT ANSWER row total x column total / table total 10. H0 of independence test CORRECT ANSWER variables are independent 11. HA of independence test CORRECT ANSWER variables are associated 12. chi sq test stat CORRECT ANSWER (obs- exp)2 / exp 13. interpretation of p-value with chi sq CORRECT ANSWER probability of witnessing test stat or higher under assumption H0 is true 14. increasing n CORRECT ANSWER dfstayssame 15. test statistic increases CORRECT ANSWER increasing n 16. ANOVA CORRECT ANSWER comparing the means of two or more groups 17. first condition of ANOVA CORRECT ANSWER observations are independent 18. second condition of ANOVA CORRECT ANSWER samples drawn from normally distributed population 19. third condition of ANOVA CORRECT ANSWER when evidence for HA, no comment on which groups are ditterent 20. F statistic CORRECT ANSWER between group variability/within group variability 21. larger F stat CORRECT ANSWER more evidence against null 22. between group df CORRECT ANSWER k-1 23. within group df CORRECT ANSWER n - k 24. total df CORRECT ANSWER n-1 25. linear regression CORRECT ANSWER relationship between two quantitative variables 26. explanatory variable CORRECT ANSWER x 27. response variable CORRECT ANSW