Name:_
Homework Assignment Ten
Due Friday, April 10th
Suggest Reading for New Material:
Chapter 9
1.) If the p-value equals 0.09 and = 0.10, what decision do you make, reject Ho or fail
to reject Ho?
2.) If the p-value equals 0.02 and = 0.10, what decisio
STA 2023H - Exam 1 Formulas
Sample Mean
x
x1 x2 xn 1
xi
n
n
Sample Variance
x x x
2
s
2
1
2
2
x xn x
n1
2
2
1
xi x
n1
Sample Standard Deviation
s
1
xi x
n1
2
Z-score for Normal Distribution Calculations
X ~ N ( , )
Z
X
~ N (0,1)
Correlation and Cov
AA
MH
DD
CM
LW
CS
JK
ES
HW
LW
JM
BV
SC
SS
JD
VR
JH
FF
LS
MG
MB
F
F
F
F
F
F
F
F
F
M
M
M
M
M
M
M
M
M
M
M
M
3682
3400
3550
3600
3625
3630
3710
3840
3540
3540
3100
3450
3450
3530
3575
3580
3600
3605
3640
3675
3770
3575.8095
3600
3638 1.2094557 1.2094557
3638
STA 2023H Homework Project Due November 16
Approximate Power of Z-test Using Estimated SD
From my EXCEL Programs webpage, download the file
Approximate Power for 1-sample and Paired-sample z-test and ttest program
For Population Mean, set the value to 1
STA 2023H Fall 2005 Exam 2
Discrete RVs : E ( X ) X xi pi
All RVs : E (a bX ) a b X
2
V (a bX ) b 2 X
Formulas
2
2
V ( X ) X ( xi X ) 2 p i xi2 pi X
E (a1 X 1 a n X n ) a1 1 a n n
2
2
V (aX bY ) a 2 X b 2 Y 2ab X Y
X 1 ,., X n Independent
2 2
V (a1 X 1 a
STA 2023 Final Exam Formulas (Chapters 7&8)
Confidence Intervals: Estimate Critical Value * Standard Error
Significance Tests: Test Statistic
Parameter
Estimate
X
Estimate - Parameter(H 0 )
Standard Error
Estimated Std Error
s
Distribution
tn-1
n
D
tn-1
Chapter 5
Sampling Distributions
Introduction
Distribution of a Sample Statistic: The probability
distribution of a sample statistic obtained from a
random sample or a randomized experiment
What values can a sample mean (or proportion)
take on and how l
Chapter 3
Generating Data
Introduction to Data Collection/Analysis
Exploratory Data Analysis: Plots and Measures
that describe a set of measurements with no clear
research questions posed.
Statistical Inference: Methods used to make
statements regarding
STA2023HInClassProject
9/11Effectsonairrevenues
1. DownloadtheU.S.AirlineDataPre/Post9/11
o Variablesare:
o City1
o City2
o PopulationofCity1(1000s)
o PopulationofCity2(1000s)
o Distance
o AverageFare2000q4
o AverageWeeklyPassengers2000q4
o AverageFare200
MAR 5620
In-Class Project 1 Spring 2005
Step 1: Download the U.S. SMSA Per Capita Retail Sales 1992 dataset as a
text (.txt) file to your computer
Step 2: Import the file to EXCEL
File Open Filename (text file) Dialog box opens
Original data type: FIXED W
Name: _
Homework Assignment Two
Due Friday, Jan. 23rd
Suggested Reading: Chapter 2: Sections 3-5
1.) Answer the following questions.
a) List two measures of center.
b) List four measures of spread.
c) List the five number summary statistics.
d) What measu
Homework Assignment Eleven
Due Friday, April 17th
Suggest Reading for New Material: Chapter 10 Sections 1 3
Name: _
Part A Identify each of the following as either two independent proportions, two
independent means and means of dependent samples.
1.) Does
Practice Questions for Exam 1
1. A used car lot evaluates their cars on a number of features as they arrive in the lot in
order to determine their worth. Among the features looked at are miles per gallon
(MPG), make and model (ie. Toyota Camry), number of
Practice Questions for Exam 1
1. A used car lot evaluates their cars on a number of features as they arrive in the lot in
order to determine their worth. Among the features looked at are miles per gallon
(MPG), make and model (ie. Toyota Camry), number of
Practice Exam 3
1. A simple random sample of commuting UF students was taken to determine the
average amount of money spent on gas per week. The 34 students surveyed gave an
average expenditure of $15.80 with a standard deviation of $4.25. Does it appear
Practice Questions for Exam 2
Formulas for the test
Mean = np
Standard deviation =
z
1
n
Normcdf(bottom, top, mean, stdev)
Invnorm(proportionless, mean, stdev)
Binompdf(n,p,x)
Binomcdf(n,p,x)
Sampling Distributions
Mean
Standard Deviation
Sample means
n
S
Name:_
Homework Assignment Nine
Due Friday, April 3rd
Suggest Reading for New Material:
Chapter 8 - 9
1. In 2008, the General Social Survey asked a random sample of 2,017 people if they were trying
to start their own business. Out of 2,017 people, 200 peo
Name: _
Homework Assignment Eight
Due Friday, March 27th
Suggest Reading for New Material: Chapter 8 Sections 1 3
1. In the 2010 the General Social Survey (GSS), 1192 people were asked if they had had
trouble sleeping in the past year. Out of the 1192 peo
Name: _
Homework Assignment One
Due Friday, Jan. 17th
Reading: Chapter 1; Chapter 2 Sec. 1 2
1.) Define the following terms from Section 1.1 (Use your notes or textbook.)
Description:
Design:
Inference:
2.) The following is an excerpt from a New York Time
Name:_
Homework Assignment Four
Due Friday, Feb. 13th
Suggest Reading: Chapter 4
1.) Explain the difference between an observational study and an experiment.
2.) Give an example of leading question.
3.) What is the problem with having a leading question i
Name: _
Homework Assignment Three
Due Friday, Jan. 30th
Suggest Reading: Sections 3.2, 3.3
1.) Define the term correlation from section 3.2 in the textbook.
2) For each scatterplot, describe the form, direction, strength and outliers.
a.) This shows the r
Name: _
Homework Assignment Five
Due Friday, February 20th
Suggest Reading: Chapter 4 and Chapter 5
1.) Select the best answer for the question below.
A simple random sample of size n is one in which _ .
a) you keep sampling until you have a fixed number
Name:_
Homework Assignment Seven
Due Friday, March 13th
Suggest Reading for New Material: Chapter 6 Section 2-3
1. In 2014, about 34% of Americans voted in the last election. Suppose that this value is the
same for students at UF. A sample of eight studen
Name:_
Homework Assignment Six
Due Friday, Feb. 27th
Suggest Reading: Chapter 5 Section 1 3, Chapter 6 Section 1- Section 2
1. List the probability model for the below situations. (Remember to list the entire sample
space and then to list the probabilitie
Chapter1
Looking at Data - Distributions
Introduction
Goal: Using Data to Gain Knowledge
Terms/Definitions:
Individiduals: Units described by or used to obtain
data, such as humans, animals, objects (aka
experimental or sampling units)
Variables: Char