Chapter 1: Introduction to data
Yingbo Li
Southern Methodist University
STAT 2331
Yingbo Li (SMU)
Ch 1: Introduction to data
STAT 2331
1 / 82
Outline
1
Data basics
2
Overview of data collection principles
3
Observational studies
4
Experiments
5
Examining
Name.
Lab section
Practice Exam 1, STAT 2331
Please do all questions.
1. Which of the following statements is ALWAYS TRUE?
a. The sample median is more sensitive to extreme values than the mean.
b. The sample standard deviation will be larger than the me
Study Guide for Final Exam
SPAN 2401
Fall 2016
The final exam is comprehensive, i.e. covers all material from Chapters 12-18. As with any Spanish exam,
everything we learn builds on material previously learned, so any material learned in SPAN 1401, 1402,
Name.Lab section
Practice exam questions, exam 2, STAT2331
Multiple Choice:
1) A home monitoring company claims to be able to respond to alarms on average in
5 mins. A random sample of 50 alarm incidents has a mean response time of 7 mins
with a 95% confi
Name
Practice exam 3 QUESTIONS, STAT2301
Please do all questions.
Multiple choice (please select one answer only)
1) Suppose a 95% confidence interval for the true proportion (p) of people who say they
approve of Barack Obama as President is (50%, 56%). O
Practice Exam 2, STAT2301, Spring 2016.
Multiple Choice:
1) Which of the following is a false statement concerning the Central Limit Theorem?
(a) if n is large then the sampling distribution of the sample mean can be
approximated closely by a normal curve
Chapter 15 Sampling Distributions
Chapter 15 Contents:
- Parameters and Statistics
- Statistical Estimation and the Law of Large Numbers
- Sampling Distributions
- The Sampling Distribution of 3c
- The Central Limit Theorem
Parameters and Statistics
Pop
Practice Test
Provide a definition or equation for all equations, clearly identify variables.
1. P-value:
The probability of observing a result, by random chance, as extreme or more
extreme than what was observed given that the null hypothesis is true.
2.
Kait Willis
Homework Assignment #1
Jan. 26, 2016
Problem 2: Test the claim that the mean math score is equal to 50. Write all
6 steps.
The histograms and qq plots provide do not provide enough evidence to
suggest normal distributions among the math scores
d.)Stepwise Regression
e.)Lasso:
Internal validation: you can select variables. The CV PRESS helps you identify
which variables go into the model
note: notice no C.I for LASSO, and only provides better MSE in certain
circumstances.
External:
Notes: The re
HW 3 Jessica Robertson
Instructions: All plots except Step 2 plots must be computer generated and placed in a Word
document. In addition, all HW and results must be typed and placed in the same word
document. This is good practice for when you get paid >
STAT 5371 HW 4 Jessica Robertson
I would like for this class to allow you to practice preparing professional looking reports. For this
reason, for HW 4 we will require all reports to be typed and all graphs (unless otherwise noted) to
be computer generate
STAT 5371: HW 2 Jessica Robertson
1. (5 pts) Read Chapter 1 and Chapter 2. Its a good read and VERY informative.
2. (2 pts)What are the assumptions of the one sample t-test?
a. Both distributions are normal.
b. Both distributions have identical standard d
STAT 5371: HW 5 Jessica Robertson
1. Answer the Conceptual Questions in the book for Chapter 5. You do not need to write anything
for this problem.
2. Problem 18.
a.
b)
At a alpha=0.05 significance level with Pvalue=0.0001, we can conclude that the means
HW 7: STAT 5371: Chapter 7 and 8 Jessica Robertson
1. Problem 27 Chapter 7
a. You can find the data for this problem on BlackBoard under the HW7 Item in Course
Documents / Homework (Male Display Data Set.csv).
b. Analyze the data providing at least the fo
THE DOUBLE QUIZ! SPRING 2015 VERSION B
IBM is composed of thousands of branch offices that each have their own budgets and managers. I
study of a random sample of 6 of these branches yielded the data below. The question of interest was if
the marketing bu
STAT 2301 Quiz 2: Histograms and Statistical Graphics
Below is the KPMG survey of corporate tax rates by country.
1. Given the Data Create a nice looking Frequency Chart, Relative Frequency Chart and Cumulative
Frequency Chart.
Tax Rate
0% to 10%
11% to 2
THE DOUBLE QUIZ! SPRING 2015 VERSION A
IBM is composed of thousands of branch offices that each have their own budgets and managers. I
study of a random sample of 6 of these branches yielded the data below. The question of interest was if
the marketing bu
STAT 2301 QUIZ 1
1.
Give an example of variable with an ordinal level of measurement.
Letter grades, ranks of cities, Likert Scale (does not meet expectations, meets expectations, exceeds
expectations)
2. Firehouse is a top marketing and advertising firm
Quiz 5: Normal Distribution
Hi Class! As we covered in class, a z-score can be simply interpreted as the number of standard deviations
away from the mean. For the following problems assume that the random variable X represents the number
Mac Book Pros are
QUIZ 16: Multiple Regression
High School and Beyond was a longitudinal study initiated in the 80s to track success based on academic
scores. Students test scores on Math, Reading Science and Social Studies Courses were recorded and a
random sample of 200
Quiz 17: Moving Average and Exponential Smoothing
1. Watch this video on Moving Averages! (You may have to scroll down a bit to see the video!)
http:/www.investopedia.com/terms/m/movingaverage.asp
2. The Bureau of Transportation Statistics conducts a quar
Quiz 14: Correlation and Regression
Below is a list of a few of my favorite movies. I have looked up the Budget, Gross and the IMDb Rating.
Movie
Fletch
The Big Lebowski
Garden State
Shawshank Redemption
Revenge of the Nerds
Billy Madison
Idiocracy
Europe
Quiz 11:
Two sample Hyp Test and Conf Interval for Mean
1. Are severe psychiatric disorders related to biological factors that can be
physically observed? One study used x-ray computed tomography to collect
data on brain volumes for a group of patients wi