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(SOSC1100)[2012](f)final~=u8rzkjdy^_62717.pdf
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SOSC 1100
Final Exam
Fall, 2012
December 19, 2012

DO NOT go to the next page until instructed!!




1. The exam is in-class and closed book. You are allowed to use only a pen and/or pencil, an eraser, and a calculator (with no communication function) during the exam.

2. Two blank sheets for calculations are attached after Appendix tables. You are not allowed to use any other papers for calculation.

3. You may detach tables and scratch papers from the answer sheets (pages 15-16). BUT, answer sheets (pages 1-14) should remain stapled together.

4. Write down your name on the front page and on the top of EACH PAGE of your answer sheets.

5. All your answers have to be legible. Illegible answers will get zero points.

6. The exam consists of SIX PARTS. You have 170 MINUTES to write this exam.

7. If you find any question ambiguous, raise your hand and ask an instructor.

8. You MUST NOT communicate or attempt to communicate in any way with any student or receive or attempt to receive any communication from any person during the examination. Such forms of communication include but are not limited to: oral communication, written or visual communication, and any form of electronic or telephonic communication.

9. The violation of 1, 2, 7 and 8 will be automatically considered as cheating.







Part I. True/False:
Please check the box beside a correct choice

(1) The standard error of the proportion will be maximized when the proportion is 0.5.

True
or

False



(2) As the probability of Type I error decreases, the power of test increases.

True
or

False



(3) Two random variables X and Y are statistically independent if, and only if,
P(X = x, Y = y) = P(Y=y | X = x)*P(X = x).

True
or

False



(4) When there is no linear correlation between two variables, we would expect the coefficient of determination to be 1.

True
or

False



(5) The expected value of the sampling distribution of the means is the same as the population mean only when the sample size is larger than 30.

True
or

False



(6) The insignificant Pearson correlation between X and Y guarantees that X and Y have no relationship.

True
or

False



(7) The Central Limit Theorem indicates that as the random sample size increases, the sampling distribution of the means approaches a normal distribution.

True
or

False



(8) When two independent variables are highly correlated with each other, we always have a problem of multicollinearity.

True
or

False



(9) Homoscedasticity means that the relationship between the two variables stays the same at all points.

True
or

False



(10) Suppose we have three observations {10 cm, 20 cm, 36 cm}. If we add another observation 20 cm, the value of median stays the same w