Exam 1 Practice Questions
Exam 1 Practice Questions STA 210
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This 2 page Study Guide was uploaded by Maddi Caudill on Thursday February 11, 2016. The Study Guide belongs to STA 210 at University of Kentucky taught by Dr. William S. Rayens in Spring 2016. Since its upload, it has received 47 views.
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Date Created: 02/11/16
In Class Exam 1 Review Thursday, February 11, 2016 9:40 AM 1. About how many babies are born each year in the US? • 4 million 2. How many people die each year from heart disease? 000 , 00•6 3. In the piece on Deathly Hallows book sales, it was claimed that more than 50,000 were sold per minute on the average. What was wrong with this ﬁgure? • 300,000 were sold on average each hour. That means only 5000 were sold per minute. Decimal error. 4. What can you say about the correlation coefﬁcient? • Between -1 and 1 5. • Positive and strong 6. The placebo effect is best described as: • Real response to fake treatment 7. Suppose you have a data set with 1000 observations in it. 500 of those are all 5 and 500 are 15. What of the following are true? • The mean and median are the same 8. In this class we relegated all confounding to two possible sources. What are those? • Improper comparison and lack of randomization 9. What is a "quasi experiment" and why were we interested in them? • Experiments unable to use randomization to evaluate treatment effectiveness 10. Confounding often defeats attempts to show that one variable causes changes in another variable. Confounding means that: • The effects of two or more variables are mixed up, so we cannot say which is causing the response 11. Which of the following statements do you think could possibly be true? • The number of students enrolled at Midville University decreased by 10.4% last year
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