Exam 2 with answers

Exam 2 with answers - NAME: SPIRE ID: PSYCH 240 (Section A...

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NAME: SPIRE ID: PSYCH 240 (Section A ) : EXAM TWO October 27, 2008 36 Multiple Choice Questions NOTE : Choose the one best answer for each question Use the following situation to answer the first two questions : A group of students is taking Statistics 101. Half of these students receive one extra day per week of one-on-one tutoring (ÒGroup 1Ó), whereas the other half of these students receives no extra help (ÒGroup 2Ó). At the end of the semester, the reaction times for the students in these two groups are compared. 1) Which of the following could be the research hypothesis? a. Reaction times from students in Group 1 will be different than students in Group 2. b. Reaction times from students in Group 1 will be higher than students in Group 2. c. Reaction times from students in Group 1 will be lower than students in Group 2. d. All of the above. 2) Which of the following is the null hypothesis? a. There will be no difference in reaction times between Group 1 and Group 2. b. Reaction times from students in Group 1 will be the same as students in Group 2. c. Extra tutoring will have no effect on the reaction times of students in Group 1. d. All of the above. For the next 3 questions, read the given hypothesis and determine whether you will run a one- tail or a two-tail hypothesis test: 3) H A : 1 st graders who learn to read using Method 1 are faster readers than 1 st graders who learn to read using Method 2 a. One-Tail b. Two-Tail c. Not enough information 4) H A : Women who participate in a 12-week exercise program on average have different depression scores than women who donÕt participate in a 12-week exercise course. a. One-Tail b. Two-Tail c. Not enough information 5) H A : College students from MA will have SAT scores that are higher than the national average SAT score a. One-Tail b. Two-Tail c. Not enough information
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6. Rejecting the null hypothesis when itÕs true is an example of? a. Type I Error b. α (ÒalphaÓ) c. Type II Error d. β (ÒBetaÓ) 7. The probability of correctly rejecting the null hypothesis is? a. Type I Error b. 1 - α (Òone minus alphaÓ) c. Type II Error d. 1 - β (Òone minus betaÓ) 8. What type of error do you make if you fail to reject the null hypothesis when itÕs false? a. Type I Error b. α (ÒalphaÓ) c. Type II Error d. β (ÒBetaÓ) 9. What is the probability of making the error described in question #8? a.
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Exam 2 with answers - NAME: SPIRE ID: PSYCH 240 (Section A...

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