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Exam1sp07 - Exam 1 Spring 2007 1 Name Psych Stats Spring...

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Exam 1 Spring 2007 Name_________________________ Psych Stats Spring 2007 Brannick Exam 1 Instructions: Write your name, U number, and section number on the scantron. Answer any 45 of 50 questions on the exam by bubbling in the best of the four alternatives given. For those questions you wish to omit, bubble in “e.” If you answer all 50, I will choose the last 5 for you, so it is in your interest to pick 5 and bubble in “e”. Handy formulas: SD X X z - = A=(z*100)+500 T=(z*10)+50 z=(A-500)/100 z=(T-50)/10 A=10T N X X = N X = μ N X - = 2 ) ( μ σ N X - = 2 2 ) ( μ σ N X X S X - = 2 2 ) ( ; N X X S X - = 2 ) ( 1 ) ( 2 2 - - = N X X s X ; 1 ) ( 2 - - = N X X s X Tabled values of z, the unit normal. Z Between mean and z Beyond z Z Between mean and z Beyond z 0.00 0.0 50.00 0.90 31.5 18.41 0.10 3.98 46.02 1.00 34.13 15.87 0.20 7.93 42.07 1.10 36.43 13.57 0.30 11.79 38.21 1.20 38.49 11.51 0.40 15.54 34.46 1.30 40.32 09.68 0.50 19.15 30.85 1.40 41.92 08.08 0.60 22.57 27.43 1.50 43.32 06.68 0.70 25.80 24.20 1.60 44.52 05.48 0.80 28.81 21.19 1.70 45.54 04.46 1
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Exam 1 Spring 2007 Chapter 1 Introduction to Statistics and Research 1. When we conduct research, we are usually interested in a very large number of people, such as all the people in the U.S. What is the name that statisticians use to refer to the whole group? a. Population b. Potpourri c. Sample d. Zoo 2. It is usually too difficult and expensive to study the entire group of interest. So instead, we study a smaller subgroup of the entire group of interest. What name do statisticians use to refer to the subgroup? 3. A parameter is a statistician’s name for a measurable characteristic of a 4. A distribution is a collection of data about an attribute of interest. Such an attribute is called a __________ in research. 5. When we use inferential statistics, we are a. Manipulating independent variables experimentally b. Using random assignment to experimental conditions c. Collecting, organizing, and analyzing numerical facts d. Using data from a sample to answer questions about a population 2
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Exam 1 Spring 2007
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