ST 311 Test 1 and Answers

# ST 311 Test 1 and Answers - Statistics 311 Exam 1 Practice...

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Statistics 311 Exam 1 Practice Exam Page 1 of 8 Version 1a NOTE to students: This is the actual exam from a previous semester. It is intended to give you an idea of the type questions the instructor asks and the approximate length of the exam. It does NOT indicate the exact questions or the topics covered. Students should refer to the appropriate study guides to determine the coverage of the material and appropriate questions.

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Statistics 311 Exam 1 Practice Exam Page 2 of 8 Version 1a Name:_______________ Instructor:_____________ Class Time:______________ Instructions: o Put your name, instructor, and class time in the space provided. o Read each question carefully. o Show all work to receive full credit. o Make all work legible. o Provide one answer to each question in the space provided. o A copy of table A is attached. . Honor Pledge: I certify that I have not received or given unauthorized aid in taking this exam. Signed:________________
Statistics 311 Exam 1 Practice Exam Page 3 of 8 Version 1a True/False- Circle the best answer (3 points each). 1. True False A sampling frame is a list from which a random sample is chosen. 2. True False The mean of a distribution always has 50% of the data above it and 50% below. 3. True False It is easy to determine if a distribution is bimodal by looking at a box plot. 4. True False Outliers have more influence on the mean than on the median. 5. True False A standard score which is negative would correspond to a raw value that is above the mean. Multiple Choice- Circle the best answer (3 points each). 6. A voluntary response sample is often biased because a. only people with strong opinions tend to respond . b. it suffers from undercoverage. c. the parameter is unknown. d. only people who have the internet can respond. 7. A forestry researcher recorded many variables on the trees of a large forest.

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## This note was uploaded on 03/24/2008 for the course ST 311 taught by Professor Modlin during the Spring '08 term at N.C. State.

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ST 311 Test 1 and Answers - Statistics 311 Exam 1 Practice...

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