Mock Exam #4: Final Exam
1. Define Inferential Statistics:
2. Confidence intervals are predictions/estimates of a _(A)_ value that consists of
_(B)_ and _(C)_.
3. T/F The t-distribution is symmetric and bell shaped.
4. What is the only parameter of the t-
Mock Exam #1
*Review your definitions
True / False:
1.
2.
3.
4.
5.
6.
7.
Inferential Statistics is the use of sample information to learn about a population.
A confidence interval is an estimation of a sample value.
Hypothesis is a speculation about a sam
Sampling Methods
Xuan Huang, PhD
Why use sample instead of population?
The physical impossibility of checking all items
in the population.
The cost of studying all the items in a
population.
Contacting the whole population would often
be time-consumin
Point Estimation and Confidence
Interval
Xuan Huang, PhD
The t distribution
When the population standard deviation is not
known, we use the sample standard deviation
s
X
s/ n
follows the t distribution
X
/ n
follows the _ distribution
Xuan Huang, PhD
A baseball analytics specialist wants to determine which variab
important in predicting a team's wins in a given season. He ha
data related to wins, earned run average (ERA), and runs sco
the 2012 season. Help him to develop a model to predict the n
winds
Open Excel file (data tab). It contains the time series of Net Sales, Receipts, & Operating Revenues:
Quarterly Financial Report (Millions of Dollars) of all retail trade in U.S.
(1) Assuming a multiplicative model, follow the 5-step deseasonalization pro
Cleanliness
Not enough
janitorial
services
Unsatisfactory
Doctors visits
Doctor was
rushed
Lack of
supervision
Inadequate
after- care
Understaffed
Insufficient
training
Insufficiently
trained
Quality Issues
Improper
Prep
Lack of
nutritional
value
Substand