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MA251 Final Exam - Statistics II
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MCQs on Statistics.

MA251 Final Exam - Statistics II
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25 Questions

1. Which nonparametric test is equivalent to a parametric t-test for independent sample means?
2. Which of the following is NOT true about exponential smoothing in time-series analysis?
3. Which of the following is true about endogenous and exogenous variables in structural equation models (SEMs)?
4. Which test can be used to test normality of data?
5. You are tasked with predicting the heights of sons, which are influenced by genes from both sides of the family.You already have data on the heights of their mothers. You are now allowed to measure a second predictor variable.Choose among the following predictors a second variable that would help most with the predictions.
6. Which of the following statement is correct?
7. In the context of Generalized Linear Models (GLM), what is the link function for logistic regression?
8. In support vector machine, which term is used to refer to the separation between classes?
9. Which of the following is the equation for logistic regression?
10. The sample variance for X and Y are 1 and 4, respectively.The sample correlation is 0.5.What is the slope of the least squares line?
11. Which of the following is polynomial regression model?
12. In the model y = a0 + a1x + a2x2, what is the value of a2 if the relationship between y and x is linear?
13. You conducted a 2 (gender) x 4 (treatment group) analysis of responses to 4 different treatment regiments for depression.You conducted a two-way ANOVA and found that the F-value for the corrected model is significant.Which conclusion can you make based on this analysis?
14. Fill in the blank. ______ is used to determine whether an additional variable makes a significant contribution to a multiple regression model.
15. Which non-parametric test would you use to assess whether there is a significant difference between the mean ranks of two conditions?
16. Let yi be the observed values in a dataset and fi be the modeled values from a regression.Let ymean be the mean of the observed data.Which of the following is the regression sum of squares (SSR)?
17. You have three groups of patients, and each group is comprised of ten males and ten females.The dependent variable is the reduction in cholesterols following a treatment. You predict that Group A will respond to treatment better than Group C, and that males will respond to treatment less than females.Which method do you use to confirm your prediction?
18. The correlation coefficient between two random variables is 0.85, which indicates
19. Fill in the blank. Multicollinearity occurs when ________.
20. When do you need to use dummy variables in a multiple regression?
21. Which factors do the adjusted coefficient of determination adjust for?
22. Rj2 is the coefficient of determination of the model that includes all predictors except the jth predictor.Which of the following formula is used to calculate the variance inflation factor (VIF)?
23. What is the F ratio in a one-way ANOVA?
24. Which of the following is not true about the correlation coefficient?
25. The following data x =[18 20 22 24] and y = [76.1 77.0 78.1 79.7] are fitted with a linear regression.What is the slop of the line?

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