Chapter 3 and 4 Practice Quiz

Chapter 3 and 4 Practice Quiz - compare the grade point...

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9/15/2010 1 Stats 250 Fall 2010 The next 5 slides are short questions on the topics from chapters 3 and 4. Solutions are on the last slide. Q1: Most statistical inference techniques require the data to be… A) a population. B) a census. C) a random sample. Q2: When a representative sample is selected but only a small proportion are actually able to be contacted (after many attempts), the problem is called… A) confounding. B) selection bias. C) nonresponse bias. D) response bias. Q3: Random sample of 1,000 college students 16% said they had used Ecstasy. An approximate 95% confidence interval for the population proportion of all college students that have used Ecstasy is: A) 16% ± 3.2% B) 16% ± 6.4% C) 95% ± 3.2% D) Unknown, because we don’t know the population proportion. Q4: 100 students were followed over a 6-month period. The number of students who took Echinacea (herbal supplement) and the number who developed colds were recorded. This is an example of an … A) Observational Study. B) Experiment. Q5: A study was conducted to
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Unformatted text preview: compare the grade point averages (GPAs) of male and female students majoring in Psychology. In this study A) Gender and GPA are both response variables. B) Gender and GPA are both explanatory variables. C) GPA is an explanatory variable and Gender is a response variable. D) Gender is an explanatory variable and GPA is a response variable. 9/15/2010 2 SOLUTIONS: 1. C) random sample 2. C) nonresponse bias 3. A) 16% 3.2% 4. A) Observational Study. 5. D) Gender is an explanatory variable and GPA is a response variable. Great Job Today Friday On to Probability to quantify uncertainty about our sample estimates. Practice HW due tonight 11 PM. First real HW 1 available tomorrow 8 AM. Tech problems? support@lecturebook.com Ch 2, 3, 4 full notes, Practice quiz questions and solutions on Ctools this weekend. Prelab Lesson 02 available later tonight. Complete before next weeks lab section....
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This note was uploaded on 12/31/2011 for the course STATS 250 taught by Professor Gunderson during the Winter '10 term at University of Michigan.

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Chapter 3 and 4 Practice Quiz - compare the grade point...

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