Study Guide for exam 3 pt 1
Study Guide for exam 3 pt 1 STAT 110 - 002
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This 4 page Study Guide was uploaded by Mackenzie Shapiro on Wednesday November 18, 2015. The Study Guide belongs to STAT 110 - 002 at University of South Carolina taught by Gail Ward-Besser (P) in Fall 2015. Since its upload, it has received 231 views. For similar materials see Introduction to Statistical Reasoning in Statistics at University of South Carolina.
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Date Created: 11/18/15
Stat Test 3 Study Guide 1. The probability of a random outcome is a. Unpredictable b. ½ c. the proportion of times the outcome would happen in a large number of repetitions 2. If you assign the probability of 1/6 for rolling a 2 because the die is fair, what type of probability are you using? a. Empirical probability b. Theoretical c. Personal probability d. Random 3. A probability of 1 can be interpreted to mean a. The event has a 0.01% chance of happening b. The event has a 1% chance of happening c. The event has a 100% chance of happening 4. Getting a 2 on the first roll and a 2 on the second roll of a die are considered _____ events? a. Disjoint b. Independent c. Codependent 5. Two events are independent if a. they share outcomes in common (have an intersection) b. They share no outcomes in common (no intersection) c. The occurrence of one event does not affect the occurrence of the other event d. They are in different sample spaces 6. Suppose the odds for getting a speeding ticket are 1. Find the probability of getting a speeding ticket. a. 1 b. ½ c. 2 d. 0 7. One might use stimulation to compute a probability when a. We do not know the probability model b. The events are complete c. We do not have random digits d. There is a lot of time for computations 8. The Central Limit theorem says that for a random sample, the sample mean will a. Be normally distributed b. Be normally distributed with a large enough sample size c. Be equal to the population mean d. It is not a distribution 9. What is true about the sampling distribution of the sample proportion? a. It is skewed b. Nothing is known about it c. It has a normal distribution d. It is not a distribution 10. the sampling distribution of a statistic a. describes the confidence interval b. is contained in the confidence interval c. describes the possible values of a statistic and how often it takes those values d. all of the above 11. A 95% confidence interval says that a. the statistic will be contained in the interval 95% of the time b. the parameter will be within 95% of the statistic c. neither of the above d. both A and B A random sample of US adults were asked if a car is a necessity to life. The resulting 95% confidence interval for the proportion who thinks a car is a necessity is (0.83, 0.89). 12. Choose the correct interpretation a. We are 95% confident that between 83 and 89% of US adults in the sample think having a car is a necessity b. We are 95% certain that between 83 and 89% of US adults think having a car is a necessity c. We are 95% confident that between 83 and 89% of all US adults think having a car is a necessity 13. Using a bigger confidence level will result in the confidence interval being a. the same width b. wider c. narrower d. not enough info to say Researchers studied the effect of sunlight on multiple sclerosis (MS). They exposed rats to a protein which resulted in MS symptoms and then allowed one group exposure to sunlight and the other group no sunlight. It was believed that exposure to sunlight would reduce MS symptoms. 14. Find the Ho, the null hypothesis a. MS symptoms are the same for sun and no sun groups b. MS symptoms more prevalent for sun groups c. MS symptoms less prevalent for sun group d. MS symptoms different for sun and no sun groups 15. The the Ha, the alternative hypothesis a. MS symptoms the same for sun and no sun groups b. MS symptoms more prevalent for sun groups c. MS symptoms less prevalent for sun group d. MS symptoms different for sun and no sun groups 16. 25 Their statistical test returned a P-value of 0.001. Interpret this P-value a. There is a 0.1% reduction in MS symptoms when exposed to sunlight b. There is a 0.1% chance MS symptoms are the same whether exposed to sun or not c. There is a 0.1% chance of seeing this much reduction in MS symptoms if sunlight really does reduce MS symptoms d. There is a 0.1% chance of seeing this much reduction in MS symptoms if MS symptoms are the same for sun and no sun exposure Answer Key: 1. C 2. B 3. C 4. B 5. C 6. B 7. B 8. B 9. C 10. C 11. C 12. C 13. B 14. A 15. C 16. D
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