Extra exam practice
A college newspaper interviews a psychologist about a proposed system for rating the teaching
ability of faculty members. The psychologist says, The evidence indicates that the cor
STA 1380: Ch. 2 4 Practice Problems
Dont forget to also study the material from Chapter 1!
1. Your home town is giving out free raffle tickets for a variety of gift cards to Dicks
Sporting Goods. Out
y Analysis of IQ By X
Oneway Anova
Summary of Fit
Rsquare
0.078173
Adj Rsquare
0.038094
Root Mean Square Error
14.67606
Mean of Response
Observations (or Sum
Wgts)
100.6
25
t Test
2-1
Assuming equal v
utions
Difference
Summary Statistics
Mean
Std Dev
Std Err
Mean
Test Mean
-0.041667 Hypothesized
Value
0.2401073
Actual Estimate
0.069313
DF
Upper 95% 0.1108902 Std Dev
Mean
Lower
-0.194224
95% Mean
N
STA 1380: Ch. 2 Practice Problems
1. (a) What value should A be in the table below for us to have a probability distribution?
X
0
1
2
3
f (x)
A
0.1
0.2
0.5
(b) Is this a discrete or a continuous distr
STA 1380: Ch. 3 Practice Problems
1. During the spring semester I walked to campus every day. Suppose the time it took
for me to walk from my house to my office on campus has a uniform distribution fr
STA 1380: Ch. 4 Practice Problems
Note: There may be a chapter 3 problem in here somewhere.
1. Suppose the number of coffee beans needed to make a cup of coffee at the nearest
Starbucks is normally d
STA 1380: Ch. 5 7 Practice Problems
1. Researchers are interested in the impact hypnosis has on motivation to do class work
for high school seniors (some of whom may be experiencing senioritis). The a
STA 1380: Ch. 6 Practice Problems
Unless otherwise specified, use a 5% significance level.
For any hypothesis testing problem where you reject H0 , find an appropriate confidence
interval for the pa
STA 1380: Ch. 7 Practice Problems
Unless otherwise specified, use a 5% significance level.
All JMP output is included with the solutions.
1. Does drinking caffeine really improve your focus to start
STA 1380: Ch. 8 Practice Problems
Unless otherwise specified, use a 5% significance level.
1. In an attempt to boost sales, a local clothing store performs a study to examine the
impact of different
STA 1380: Ch. 9 Practice Problems
Note: The JMP output can be found at the end.
1. Is a high school seniors final GPA a good predictor of the students final college GPA?
To examine this relationship,
STA 1380: Ch. 5 Practice Problems
1. A sample of Alzheimers patients were tested to assess the amount of time they spend
in stage IV sleep. It has been hypothesized that individuals suffering from Alz
Syllabus
Rafael Mendoza-Arriaga
Rafael Mendoza
Elementary Business Statistics Syllabus
McCombs
Syllabus Highlights
Your Instructor
Rafael Mendoza-Arriaga, Ph.D.
My last name is Mendoza-Arriaga, not ju
Chapter 12 Sample Surveys
How do we gather data?
Surveys
Opinion polls
Interviews
Studies
Observational
Retrospective (past)
Prospective (future)
Experiments
Population
the entire group of individuals
What is the Shape of the Distribution?
1.Does the histogram have a single, central hump or several separated bumps?
2.Is the histogram symmetric?
3.Do any unusual features stick out?
Humps and Bumps
1
Chapter 4
Displaying Quantitative Data
Dealing With a Lot of Numbers
Summarizing the data will help us when we look at large sets of quantitative data.
Without summaries of the data, its hard to grasp
Chapter 3
Displaying and Describing
Categorical Data
The Three Rules of Data Analysis
The three rules of data analysis wont be difficult to remember:
1.Make a picturethings may be revealed that are no
Contingency Tables
A contingency table allows us to look at two categorical variables together.
It shows how individuals are distributed along each variable, contingent on the value of the other
varia
Chapter 2
Data
What Are Data?
Data can be numbers, record names, or other labels.
Not all data represented by numbers are numerical data (e.g., 1=male, 2=female).
Data are useless without their contex
Counts Count
When we count the cases in each category of a categorical variable, the counts are not the data, but
something we summarize about the data.
The category labels are the What, and
the indiv
CH 4 Day 1: Describing Quantitative Data:
Histogram & Dot Plot
When discussing a distribution, be it a histogram, dot plot
or stem plot, the following items need to be addressed:
Center
Unusual featur
Homework 5:
13)
Thomas should spend his $48 on 5 nights of bowling ($40 spent on bowling) and 2 nights of
billiards ($8 spent in billiards). The total utility form 5 nights of bowling equals (56 + 48
Portfolio with Same Expected Return as the Benchmark
2.2
We can generate other portfolios dierent than the Minimum TE portfolio that will give us the
same return as the Benchmark. However, since these
Denition: Active Return is the dierence between the portfolios return and the benchmark
portfolios return.
N
X
B
B
ARtj = tj tj =
!i ri,tj tj
i=1
where i = 1, ., N stands for the ith rm in your portfo
Using StatTools
First make sure that StatTools is installed in your computer.
To define a dataset:
1. Place the cursor in one of the cells that are part of the data set.
2. Click on StatTools->Data Se
PRACTICE TEST 1
Computer processors that have higher clock speeds result in faster computers. Hence,
manufacturers like AMD price processors based on their clock speed. Usually the
processors that are
Experiments and Observational Studies
Observational studies:
Conducted by observing choices made and recording the results.
Choices are not assigned by the researcher.
Can be either retrospective (sub