# PQ4 - STA 2023 Practice Questions Final Exam 1 Which of the...

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STA 2023 Practice Questions Final Exam 1. Which of the following is not a property of the t distribution? a) has fatter tails than a Z distribution b) it is symmetric and mound shaped c) it is centered at zero d) as the degrees of freedom increase it becomes less like a Z distribution. Questions 2 – 5 An education researcher has developed a new technique to teach Spanish to high school students. To prove this new method is better, she will teach two groups of students for an entire semester, one with the new method and one with the standard method used today in high schools. She wishes to obtain 12 sets of identical twins, 24 people total, and split the twins up so that one of each twin is in Class 1, which will receive the new technique, and one is in Class 2, which will receive the old technique. At the end of the semester both classes will take a standardized exam and the results will be compared. 2. What method should be used to analyze this data? a) one mean b) two independent means c) matched pairs d) two independent proportions 3. What should our hypotheses be to test if your new method is better than the old method? a) H 0 : μ 1 2 = 0 vs. H A : μ 1 2 < 0 b) H 0 : μ D = 0 vs. H A : μ D < 0 c) H 0 : μ 1 2 = 0 vs. H A : μ 1 2 0 d) H 0 : μ D = 0 vs. H A : μ D 0 4. What distribution would you use to look up the p- value for this test of hypothesis? a) t(11) b) t(12) c) t(23) d) Z 5. Suppose we collect the data from this experiment and we find a p- value of 0.009. Which of the following is our conclusion at any reasonable alpha level? a) There is no difference between the two educational methods.

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b) The old method is better than the new method. c) The new method is better than the old method. d) We cannot determine without more information. Questions 6- 8 use the following modifications to the above scenario. Unable to obtain the 12 sets of twins to conduct the experiment, the researcher has to use two existing Spanish classes at a local high school, one with 12 students and the other one with 11 students. 6. What method should be used to analyze this data? a) one mean b) two independent means c) matched pairs d) two independent proportions 7. What should our hypotheses be to test if your new method is better than the old method? a) H 0 : μ 1 2 = 0 vs. H A : μ 1 2 < 0 b) H 0 : μ D = 0 vs. H A : μ D < 0 c) H 0 : μ 1 2 = 0 vs. H A : μ 1 2 0 d) H 0 : μ D = 0 vs. H A : μ D 0 8. What distribution would you use to look up the p- value for this test of hypothesis? a) t(11) b) t(10) c) t(23) d) Z 9. What distribution would Minitab use to find the p- value for this test of hypothesis? a) t with more degrees of freedom than we use b) t with less degrees of freedom than we use c) t with same degrees of freedom we use d) Z Questions 10 – 13 We suspect that men are convicted of DUI (driving under the influence of alcohol or drugs) more often than women. Let p 1 be the proportion of males convicted of a DUI offense and p 2, the proportion of females convicted
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## This note was uploaded on 12/15/2011 for the course STA 2023 taught by Professor Ripol during the Spring '08 term at University of Florida.

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PQ4 - STA 2023 Practice Questions Final Exam 1 Which of the...

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