Integre Technical Publishing Co., Inc.
Moore/McCabe
November 16, 2007 1:29 p.m.
moore
page T-2
T-2
Tables
Probability
Table entry for z is the area under the standard normal curve to the left of z.
z
TABLE A Standard normal probabilities
z 3.4 3.3 3.2 3.1
Some, such as the color of a persons eye, are categorical, and some, such as a familys income, are quantitative. Cornells Ranking is neither it is an ordinal variable We can organize these counts into a frequency table, which records the totals and the ca
College of Human Ecology Cornell University Ithaca, New York Department of Policy Analysis and Management PAM 2100 Intro Stats A. Sinan Unur Fall 2008
Prelim 1 Answer
October 2, 2008
Multiple Choice
MC 1) Suppose you are told that the average score on the
Section Problems #1 Circle all of your final answers. #1) Conservationists have despaired over destruction of tropical rainforest by logging, clearing, and burning. These words begin a report on a statistical study of the effects of logging in Borneo. Res
Stock and Watson Chapter 5: Regression with a Single Regressor what do the distributions of 1 and 0 look like? if the sample is sufficiently large (n=100), then: 1 ~ N (1 , standard deviation given by formula on page 133 SW, 587 MM) ~ N (0, standard devia
Stock and Watson Chapter 4: Linear Regression with One Regressor The linear regression model is: Yi = 0 + 1Xi + ui The subscript i runs over observations, i= 1,n; Yi is the dependent variable (or the regressand or the response variable or the left-hand-si
Stock and Watson Chapter 2.3- Two Random Variables Joint distribution The joint probability distribution of two discrete random variables, say X and Y, is the probability that the random variables simultaneously take on certain values, say x and y. The pr
Section Problems #3 #1) Student Student 1 Student 2 Student 3 IQ score 110 124 126 Self-concept score 58 72 83
a) What is the standard deviation of IQ scores? Round your answer to four decimal places. (2 points) b) What is the standard deviation of self-c
Section Problems #3 #1) Student Student 1 Student 2 Student 3 IQ score 110 124 126 Self-concept score 58 72 83
a) What is the standard deviation of IQ scores? Round your answer to four decimal places. (2 points) b) What is the standard deviation of self-c
Section Problems #2 From book: 1.136 (page 75) Express your answers as proportions instead of percents. Round your final answers to four decimal places. 1.139 (page 75) Express your answers as proportions instead of percents. Round your final answers to f
Section Problems #1 Circle all of your final answers. #1) Conservationists have despaired over destruction of tropical rainforest by logging, clearing, and burning. These words begin a report on a statistical study of the effects of logging in Borneo. Res
1 Rounding on problem sets and exams Rounding is an issue in this class. As a rule of thumb, if the question doesn't specify and you need to round your final answer, you should round it to four decimal places. Always use the common method of rounding. htt
Statement on the Grading of Exams On the exams, I am testing your ability to actually correctly solve the problems. The point of statistics is to arrive at the correct final answer. For example, if you are working as a research assistant and you are asked
Completing Blackboard Problem Sets The Blackboard problem sets will be posted under Assignments. Click on the problem set and it will open up. You should then print out the problem set. You can exit Blackboard. Solve the problems and write down the answer
Integre Technical Publishing Co., Inc.
Moore/McCabe
November 16, 2007 1:29 p.m.
moore
page T-20
T-20
Tables
Probability p
Table entry for p is the critical value ( 2 ) with probability p lying to its right.
( 2)*
TABLE F 2 distribution critical values
Tai
6.2
Tests of Significance
Example #1 borrowers at private 4-year college: mean debt ( a )= $21,200 (survey result) borrowers at public 4-year college: mean debt ( b )= $17,100 (survey result) the difference $4100 ( a - b ) is fairly large/ but these numbe
4.4
Means and Variances of Random Variables Mean of a discrete random variable
Suppose that X is a discrete random variable whose distribution is Value of X Probability x1 x2 x3 xk p1 p2 p3 pk
To find the mean of X, multiply each possible value by its pro
4.2
Probability Models
probability model- a description of a random phenomenon in the language of mathematics the description of a random variable has two components: a list of possible outcomes a probability for each outcome The sample space S of a rando
4.1
Randomness
toss a coin- cant predict result in advance (results vary) a regular pattern emerges after many repetitions We call a phenomenon random if individual outcomes are uncertain but there is nonetheless a regular distribution of outcomes in a la
3.3 Toward Statistical Inference Statistical inference is using a fact about a sample to estimate the truth about the whole population. A simple random sample (SRS) of size n consists of n individuals from the population chosen in such a way that every se
3.2 Sampling Design population- the entire group of individuals we want information about sample- the part of the population that we actually examine in order to gather information sample survey- survey a sample to gain info about the population voluntary
3.1
Design of Experiments
experimental units- individuals on which the experiment is done subjects- experimental subjects that are humans treatment- specific experimental condition applied to the units factors- explanatory variables in experiment levels-
2.6 The Question of Causation Often the goal in a study is to establish that changes in the explanatory variable cause changes in the response variable. What constitutes good evidence of causation? What different types of links between x and y can explain