exam2_A - STA 3024 Introduction to Statistics 2 EXAM 2...

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Unformatted text preview: STA 3024 Introduction to Statistics 2 EXAM 2 Section 5126 Form A Exam 2, Page 1 STA 3024 – Examination 2 We, the members of the University of Florida community, pledge to hold ourselves and our peers to the highest standards of honesty and integrity. Name:___________________________________ UFID #: ____________________________ Signature: ______________________________ There are 25 multiple-choice problems. Each problem is worth 4 points. The exam starts at 12:30pm and ends at 1:45pm. Good luck! Some formulas which you might find useful are: ONE WAY ANOVA: ¡¢¡ £ ¤ ¤ ¥¦ §¨ © ¦ ª «« ¬ ­ ® ¯ ¨°± ² §°± ³ £ ¤ ´ § ¥¦ ª §« © ¦ ª «« ¬ ­ ² §°± µ £ ¤ ¤ ¥¦ §¨ © ¦ ª §« ¬ ­ ® ¯ ¨°± ² §°± df TOT = N – 1 df G = g – 1 df E = N – g TWO WAY ANOVA: df TOT = N – 1 df A = a – 1 df B = b – 1 df AB = (a-1)(b-1) df E = N – ab Standard Confidence Interval: CI for μ k- μ i : ¥¦ ª ¶« © ¦ ª §« ¬ · ¥¸ © ¹º»¼½¬¾¿ µ ¥ ± ® À © ± ® ¯ ¬ Tukey Simultaneous Confidence Interval: CI for μ k- μ i : ¥¦ ª ¶« © ¦ ª §« ¬ · ¥ ÁÂÃÄÅÆÇ È­ ¬¾¿ µ ¥ ± ® À © ± ® ¯ ¬ STA 3024 Introduction to Statistics 2 EXAM 2 Section 5126 Form A Exam 2, Page 2 STA 3024 Introduction to Statistics 2 EXAM 2 Section 5126 Form A Exam 2, Page 3 STA 3024 Introduction to Statistics 2 EXAM 2 Section 5126 Form A Exam 2, Page 4 Problem 1 Suppose we have conducted a one-way ANOVA test to determine if listening to various genres of music while taking an exam affects one’s score. Which of the following would provide relatively more evidence that H : μ 1 = μ 2 =… = µ g is false? A. A smaller between-groups variation and a larger within-groups variation. B. A larger between-groups variation and a larger within-groups variation C. A smaller between-groups variation and a smaller within-groups variation D. A larger between-groups variation and a smaller within-groups variation Problem 2 In two-way ANOVA, I. We should first test to see if there is any interaction before testing for any main effects. II. If we believe there is an interaction effect, then we’ll go on to test for the main effects. A. Both I and II are true. B. Statement I is true, but statement II is false. C. Statement I is false, but statement II is true. D. Both I and II are false. Problem 3 Determine if the following statement is true or false. For four means, it is planned to construct Tukey 95% multiple comparison CIs for the differences between the six pairs. For each interval, there is a 0.95 chance that the interval will contain the true difference. A. True B. False Problem 4 Suppose you are conducting a one-way ANOVA F test. If we increase the value of MS G , while MS E stays the same, what will happen to the P-value of the test?...
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exam2_A - STA 3024 Introduction to Statistics 2 EXAM 2...

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