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(SOSC1100)[2011](f)final~=u8rzkjdy^_90996.pdf
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SOSC 1100
Final Exam
Fall, 2011
December 17, 2011

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 Appendix tables and scratch papers from the answer sheets. BUT, answer sheets (12 pages) 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 FIVE PARTS. You have 2 HOURS 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 (20pt):
Please check the box beside a correct choice

(1) When the null hypothesis is not rejected, we can conclude that the null hypothesis is true.

True
or

False



(2) A normal distribution can have more than one mode.

True
or

False



(3) Alternative hypotheses may not express the direction of the effect.

True
or

False



(4) A confidence interval is a range of numbers which the sample mean is believed to fall.

True
or

False



(5) An estimate is always practically significant when a test statistic of the estimate has the p-value of 0.01.

True
or

False



(6) Let Y and X a dependent variable and an independent variable, respectively. Homoscedasticiy means that the scores are spread along and around the mean Y in the same way at all values of X.

True
or

False



(7) A type I error can occur only when one decides to reject the null hypothesis.

True
or

False



(8) The probability of Type II error is smaller when =.01 than when = .05.

True
or

False



(9) The concept of unbiasedness refers to how the sampling distribution of the estimator behaves when the sample size grows to infinity.

True
or

False



(10) If the correlation coefficient between two variables is close to 0, the two variables cannot have any strong relationships.

True
or

False



(11) All percentiles above the median must yield positive z scores.

True
or