STAT285 Introductory Statistics for Business
Spring 2015 Midterm Exam 2 Name:
1. (3 points) If a random variable can take all natural numbers (1, 2, 3,4, 5,
It is a ( f; )
A. Discrete random variable B. Continuous random variable
5
F4
2. (3 points) If a
713-122 pcjecarhihgs (PIE) ratio of a stock-is usuay considerad by analysts who put
togethajr-nmmial- porthEi-Qs. Supposaa papuiaon of 31E PIE ratios has a mean of
' £05 and a standard deviation of 4.5.
I. What is {hp probability that a uid 40 stocks wf
Spring 2015
1 .
STAT285 Introductory Statistics for Business
Midterm Exam 1 Name:
(3 points) In a survey of the families in one county in NJ, it is found that the
average family income is $50,000, and the standard deviation is $20,000.
Which of the follow
Some practice word problems for midterm 2, STAT285 Spring 2015
1. Each time when the deer walks across the road it has a probability 0.1 to be hit
by a car. What is the probability that the 10th time crossing the road it was hit by a
car?
2. A company pro
STAT 285 SUPPLEMENTARY HOMEWORK PROBLEMS
Chapter 3 Supplementary Problems on Permutations and Combinations
4M. The Carlisle Medical Clinic has five doctors on staff. The doctors have agreed to keep the office open
on Saturdays but with only three doctors.
Some practice word problems for Midterm 1 , STAT285 Spring 2015
1. The 2010 census reveals the U.S. distribution of population by race as in the
following table
Race
White
Black
Asian
Other
Total
Population (in millions)
224
39
15
31
309
Get the relative
Introduction to Sociology
Dr. Bany
2016
SOC 164: Exam II Study Guide
In preparation for Exam II and for credit towards the exam, complete the following study guide.
For full credit your study guide must be complete and typed. Responses should be detailed,
Lecture 1
09.03.2014
Terminologies
(1)
population: A complete or universal set of objects/subjects/elements.
(2)
sample: A subset of population.
(3)
variable: A characteristic or property of the population that is of interest.
(4)
inference: An estimate o
Lecture 6
09.22.2014
HWK: Read Sections 3.2-3.3 and complete respective problems.
Theory of Sets
Universal set
s = cfw_1, 2, 3, 4, 5, 6, 7
elements/members
set A = cfw_1, 2, 3, 4
set B = cfw_4, 5, 6
Empty and null set = = cfw_
Example
Flip two coins toge
Lecture 15 10.27.2014
HWK: Read Sections 5.3 5.4 and complete respective problems.
Exam II Wednesday, 10.29.2014
Bring
1. Calculator
2. Stat Tables
3. One sheet of notes (front
and back)
4. Class Handout
Q 5.24
p. 284
x = Salary of a travel management pro
Lecture 11 10.13.2014
HWK: Read Sections 4.5 4.6 and complete respective problems.
Hypergeometric Probability
Distribution
N items
r defective
N r good
randomly select n without replacement
x = # of defectives
Two outcomes only
Fixed # of trials (n)
Trial
Lecture 14 10.22.2014
HWK: Read Sections 5.1 5.2 and complete respective problems.
Sampling Distributions
= Population mean which is a fixed number for a given population
xi
x = Sample mean =
n
changes from sample to sample
x is a random variable
In re
Lecture 5
09.17.2014
HWK: Read Section 3.1 and complete respective problems
Terminologies
experiment: a process of observing a distinct possible outcome that cannot be
predicted with certainty.
sample space: a collection of all possible outcomes associate
Lecture 8
09.29.2014
HWK: Read Sections 3.5-3.6 and complete respective problems.
Exam I (Wed. 10.01.2014)
Bring
1. Calculator
2. One sheet (i.e., 2 pages front and
back) of notes
3. One handout (when to add, when to
multiply)
Conditional Probability
P(it
Chapter 1
Homework 1 Solution
1.15
A: experiment unit: property
B: variables: sale price and zillow estimated value, quantitative data
C: For example a list of all single family residential properties in Arlington, Texas was get from the township
office,
Some practice word problems for final exam, STAT285 Spring 2015
1. Simon is interested in testing whether there are any difference between the life of
long-lasting batteries and regular batteries. He and his brother independently did
some research. They r
STAT285
Introductory Statistics for Business
Class 1: Introduction to Statistics
Statistics
Science of data
the science that deals with the collection,
classification, analysis and interpretation of
information or data RHC dictionary
the science of lea
.3 Supposeyoure given a data'set that classies each sample
unit-
into one ol tour categories: A. B. C. or D. You plan" to
ereate a computer database consisting of these dormant! you
decide't'o code the data as A m l. B»: 2. C a 3. and
D 7'" 4. Are the-dat
A?!
H
Apptying the Coaceptswasm
4.1 Tylwg ni mnde variables. Which of the {owing dcsgrxlm
czraztinnous random variable-.5. and whim: "dammit: {3139mm
madam. variabies'?
a. The number of newsgnzspms sald by the New York 'Ir'mas
mach mmmh
b. "Im: mawum m in
Chapter 4
4. The number of customers, x, waiting in line can take on values 0, 1, 2, 3, Even
though the list is never ending, we call this list countable. Thus, the random variable is
discrete.
14.
Stat 285 Selected Homework Answer Keys Ch 4
Stat 285 Sele
._ " g'llr'é'llle']
WIch hypothesis, the mm or the allurrmllve. Status;
Quo llypml'xcslé Which, is Ihc research hypmlwm;
Wllich clement 0!? a last of llypollxrsis is med «3 dccldc
V whe'llmr torrejccl the, nullhypolllesis m favor of (he alterna
tiw: lr
Stat 285 Selected Homework Answer Keys
Chapter 1
1.22
a. The data collection method used is a designed experiment.
b. The experimental units in the study are the 50,000 smokers
c. The variable of interest is the age at which the scanning method first dete