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# STAT 110: Exam 1 Study Guide STAT 110

USC

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This 5 page Study Guide was uploaded by runnergal on Friday September 9, 2016. The Study Guide belongs to STAT 110 at University of South Carolina taught by Dr. Wilma J. Sims in Fall 2016. Since its upload, it has received 159 views. For similar materials see Introduction to Statistical Reasoning in Statistics at University of South Carolina.

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Date Created: 09/09/16

Exam 1 Study Guide 1. Researchers are trying to figure out alcohol affects the typical college student’s thinking abilities. They choose a group of 500 students at USC. They gave half of the group six shots of Bacardi and gave the other group six shots of flavored water. Then the researchers asked the students to solve five long-division problems. The students that drank the flavored water finished the questions more quickly and more correctly than the students that drank the alcohol. What is the explanatory variable? a. water b. alcohol c. thinking abilities d. IQ 2. Researchers are trying to figure out alcohol affects the typical college student’s thinking abilities. They choose a group of 500 students at USC. They gave half of the group six shots of Bacardi and gave the other group six shots of flavored water. Then the researchers asked the students to solve five long-division problems. The students that drank the flavored water finished the questions more quickly and more correctly than the students that drank the alcohol. What is the response variable? a. water b. alcohol c. thinking abilities d. IQ 3. Researchers are trying to figure out alcohol affects the typical college student’s thinking abilities. They choose a group of 500 students at USC. They gave half of the group six shots of Bacardi and gave the other group six shots of flavored water. Then the researchers asked the students to solve five long-division problems. The students that drank the flavored water finished the questions more quickly and more correctly than the students that drank the alcohol. What is the population that the researchers are studying? a. all typical college students b. 500 USC students c. all USC students d. alcoholics 4. Researchers are trying to figure out alcohol affects the typical college student’s thinking abilities. They choose a group of 500 students at USC. They gave half of the group six shots of Bacardi and gave the other group six shots of flavored water. Then the researchers asked the students to solve five long-division problems. The students that drank the flavored water finished the questions more quickly and more correctly than the students that drank the alcohol. What is the sample? a. all typical college students b. 500 USC students c. all USC students d. alcoholics 5. Researchers are trying to figure out alcohol affects the typical college student’s thinking abilities. They choose a group of 500 students at USC. They gave half of the group six shots of Bacardi and gave the other group six shots of flavored water. Then the researchers asked the students to solve five long-division problems. The students that drank the flavored water finished the questions more quickly and more correctly than the students that drank the alcohol. What kind of experiment is this? a. simple comparative experiment b. matched pairs c. stratified sample d. randomized comparative experiment 6. In the previously mentioned experiment, the men were able to answer more questions than the women. What is this an example of? a. explanatory variable b. bias c. lurking variable d. placebo effect 7. In the previously mentioned experiment, some of the students that drank the flavored water still got every question wrong. What is one possible reason this occurred? a. explanatory variable b. bias c. lurking variable d. placebo effect 8. In the previously mentioned experiment, some students did not take all six shots of Bacardi. What is this an example of? a. dropouts b. undercoverage c. nonadherers d. refusals 9. A recent presidential election poll asked 1000 Americans if they would vote for Hillary Clinton if the election was today and they had to choose between Hillary Clinton and Donald Trump. 546 respondents answered yes. What is the estimated population proportion of Americans who would vote for Hillary Clinton? a. 54.6% b. 5.46% c. 4.54% d. 45.4% 10. A recent presidential election poll asked 1000 Americans if they would vote for Hillary Clinton if the election was today and they had to choose between Hillary Clinton and Donald Trump. 546 respondents answered yes. What is the margin of error for this poll? a. .03% b. .18% c. 3.16% d. 4.27% 11. A recent poll asked 3000 Americans if they would accept a free coffee sample from Dunkin’ Donuts. 2500 respondents answered yes. If the margin of error is 1.82%, and the estimated population proportion that would say yes is 83.33%, which is the correct confidence statement? a. We are 100% confident that the percentage of all adults who would take a free coffee sample from Dunkin’ Donuts is between 83.33% and 85.15%. b. We are 95% confident that the percentage of all adults who would take a free coffee sample from Dunkin’ Donuts is between 81.51% and 85.15%. c. We are 100% confident that the percentage of all adults who would take a free coffee sample from Dunkin’ Donuts is between 81.51% and 85.15%. d. We are 95% certain that the percentage of all adults who would take a free coffee sample from Dunkin’ Donuts is 83.33%. 12. In the previously mentioned poll, the researchers asked the Americans these questions after they has received a $5 gift card to Dunkin’ Donuts. This could possibly be an example of: a. unreliability b. confounding variables c. bias d. undercoverage 13. In the previously mentioned poll, the researchers only asked people that were in college at USC. This is an example of: a. unreliability b. confounding variables c. bias d. undercoverage 14. In the previously mentioned poll, the researchers only asked people that stopped by their booth on Greene Street. This is an example of: a. convenience sampling b. processing error c. response error d. nonresponse 15. In the previously mentioned poll, the estimated population proportion was 83.33%. This is an example of a: a. parameter b. sample c. statistic d. count 16. John Doe takes his blood pressure every day. He uses the same pressure cuff every day, but the measurements it takes are often very different from each other. This is an example of: a. bias b. variability c. processing error d. nonresponse 17. John Doe got a new pressure cuff, but now his blood pressure measurements are always very high. This is an example of: a. bias b. variability c. processing error d. nonresponse 18. John Doe keeps track of his blood pressure measurements in the Notes app on his phone, but sometimes he enters the responses incorrectly. This is an example of: a. bias b. variability c. processing error d. nonresponse 19. In 2015, there are 700 statistics majors out of 20,000 undergraduates at USC. In 2016, there are 750 statistics majors out of 20,500 undergraduates at USC. How should these measurements not be calculated? a. rate b. proportion c. statistic d. count 20. Who is going to do really well on this test? a. you b. you c. you d. all of the above Answer Key: 1. b 2. c 3. a 4. b 5. d 6. c 7. d 8. c 9. a 10. c 11. b 12. c 13. d 14. a 15. c 16. b 17. a 18. c 19. d 20. d

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