Baruch College, CUNY
STA2000 Prof. A. Gourgey
Sample Test Questions for Exam 1
Note: This is not a list of all possible question types; it is a cross-section of some of the types of
questions you can expect to see on Exam 1. In addition to these, also rev
Sample Final Exam A
1. A sample of 64 apples is picked from a tree. The average weight of the sample is 0.75 pounds. The
population standard deviation is 0.2 pounds. What is the 95% confidence interval for the average
weight of an apple on the tree?
a. (0
Sample Final Exam B
1. The correlation between hours spent studying and the grade received in a class is .95. What
percentage of the variation in the grade received is explained by the variation in the number of hours
spent studying?
a. 82.5%
b. 95%
c. 90
STA2000, Prof. A. Gourgey
Departmental Textbook Requirement
Our departmental textbook for STA2000 is a custom package prepared especially for
Baruch of Business Statistics: A First Course by Levine, Krebiehl, Berenson and Stephan.
All students are require
Sample Midterm IB
Section I - Multiple Choice - (75 Points)
1. Assume that 35% of the people in the United States are sports fans. A sample of 900 people is taken.
What is the probability that less than 335 people are sports fans?
A. 0.9131
B. 0.6400
C. 0
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Additional Hypothesis Testing Problems (one sample mean)
1.
A consumer group tested a brand of raisin bran cereal to see whether the cereal
really contains 300 raisins per box as advertised. A random sample of
Baruch College, Summer II 2013
STA 2000 Business Statistics I
Professor Annette Gourgey
laprofessore@hotmail.com (most reliable)
Office hours: 12-210H by appt.
Statistics Department VC 11-220
(646) 312-3350 (secretary)
(646) 312-3376 (office hours)
Requir
Business Statistics: A First Course (custom edition, Levine): Reading and HW Assignments
This guide identifies the pages to read and the important points in each chapter. If a topic is in the chapter
but is not listed below, you are not responsible for it
Sample Midterm IA
Section I - Multiple Choice - (75 Points)
1. In listing a property, real estate agencies provide information on a number of variables. Which of the
following variables related to property listings is categorical?
A. Real Estate Tax
B. Nu
Probability worksheet: Flipping a paper cup
If you flip a paper cup in the air, what are all the possible positions it can land in?
What do you think is the probability of each possible position?
Work with a partner. One person will flip the cup ten times
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Additional Hypothesis Testing Problems (one sample mean)
1.
A consumer group tested a brand of raisin bran cereal to see whether the cereal
really contains 300 raisins per box as advertised. A random sample of
Solutions to Additional Hypothesis Test Problems (1 sample mean)
1.
a.
b.
c.
2.
a.
b.
c.
3.
a.
b.
c.
H 0 : = 300 raisins per box
H 1 : 300 raisins per box
With 59 df and two-tail probability of 0.05:
Reject H 0 if t < -2.0010 or t > +2.0010
t = (294-300)/
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Some Important Probability Concepts
Long-Run Probability
Probability refers not to the outcome of a single trial, but to the relative frequency of an event
over many trials. If you flip a coin a few times, you
STAT 2000 Test Review 1
Adam Jaeger
Fall 2012
Finding the Handout
Location 1:
- Go to ELC, Free Review Sessions
- Its Test 1 Review Handout
Location 2:
- Go to http:/www.uga.edu/dae
- Click on Tutoring, then Test Reviews
Variables
Categorical / Qualita
Name _
Statistics Formulas (Levine et al.), Exam 1
Mean
x
x=
n
Quartiles
Q 1 rank = (n+1)
Q 2 (median) rank = (n+1)
Q 3 rank = (n+1)
Sample variance
( x x )2
2
s=
n 1
Sample standard deviation
Population variance
( x x )2
2
=
n
Population standard devia
Independent-samples t test: Do tutored students have higher test scores?
Tutoring
No tutoring
89
87
78
80
86
78
80
73
70
76
t-Test: Two-Sample Assuming Equal Variances
Tutoring
Mean
Variance
Observations
Pooled Variance
Hypothesized Mean Difference
df
t S
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Hypothesis Test Problems 2 Independent Samples
(1) A nutritionist decided to compare two weight-loss diets to see which one was more effective. She
randomly selected two samples of patients; one sample was fed
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Solutions to Hypothesis Test Problems 2 Independent Samples
(1)
(a) H 0 : 1 = 2 H 1 : 1 2
At 51 df and 0.05 2-tailed, Reject H 0 if t < -2.0076 or t > +2.0076
t=
X1 X 2
=
(n1 1) s + (n2 1) s
(1/ n1 + 1/ n2 )
n
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Answers to Hypothesis Testing Questions
1. The sample proportion contains sampling error, so its not exact. We have to compare the
difference to the expected sampling error (measured by the standard error) to
Practice Problems 1-sample t test
1) a) A potato chip manufacturer has a product standard of 150
mg of salt in each small bag of potato chips. He hires you to
check that the average amount of salt in the bags is neither too
high nor too low. Set up a 95%
Baruch College, CUNY
STA2000 Prof. A. Gourgey
t distribution: Questions
1. What does the Central Limit Theorem say?
2. What are the formulas for standard error of the proportion and standard error of
the mean? How are they different? When should you use e
Baruch College, CUNY
STA2000 Prof. A. Gourgey
t distribution: Solutions to Questions
Note: All these questions are straight review of the material in the t Distribution Text handout
and the textbook Chapters 8-10.
1. The Central Limit Theorem states that
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Solutions to Sampling Distribution Conceptual Questions
1. Random sampling is designed to be free of human biases. It is as fair as any sampling
can be because it selects people by number and everyone has an e
Baruch College, CUNY
STA 2000 Prof. A. Gourgey
Sampling Distributions and Interval Estimation (Levine, Chap. 7) (rev. 6-13)
Drawing Inferences from a Sample
In mid-2012, three national polling organizations each asked a random sample of approximately 1,00
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Probability Questions (rev. 1-13)
I. Long-Run Probability
1. What is the meaning of long-run probability?
2. What does long-run probability tell us about the true nature of the random process? Include
an examp
Baruch College, CUNY
STA 2000 Prof. A. Gourgey
SharedBirthdays:MoreCommonThanYouThink?
What would you guess is the probability, in a group of 25 people, that two of them have the
same birthday? How many people would have to gather together before you woul
Baruch College, CUNY
STA2000 Prof. A. Gourgey
Solutions to Probability Questions (rev. 1-13)
Note: You will do better if you try to understand the concepts below and explain them in your
own words rather than to try to memorize without understanding. Be a
New York Times, May 11, 2005
Who Needs Giacomo? Bet on the Fortune Cookie
By JENNIFER 8. LEE
Powerball lottery officials suspected fraud: how could 110 players in the March 30
drawing get five of the six numbers right? That made them all second-prize winn
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Instructor: Ronald Sabban
Course: Stat 2000 - Fall 2015
Assignment: Homework 1 - Chapter 2
Sharpe3/e 8 3
1. The human resource group for a company collected data summarizing the educational level of the company's
employees. They found that 157 have no c
Instructor: Ronald Sabban
Course: Stat 2000 - Fall 2015 Assignment: Homework 2- Chapter 3
Sharpe3/e
The marketing team at an intemet music site wants a better understanding of who their 3 32
customers are. They send out a survey to 25 customers (and use
Course Title:
Course Number:
Course Id:
Name of Instructor:
Department:
Phone:
Class Schedule:
Office Hours:
E-Mail:
Textbook:
BARUCH COLLEGE
(Fall 2015)
Statistics
STA 2000 - LMUA
sabban27408
Ronald Sabban
Department of Statistics and Computer
Informatio