Numerical Summaries of
Quantitative Data.
Means, Standard Deviations,
z-scores
Warmup
Six people in a room have a median
age of 45 years and mean age of 45
years.
One person who is 40 years old leaves
the room.
Questions:
1. What is the median age of th

Case Study #2
25 Points
This assignment can be done in pairs or on your own. NO MORE THAN 2 PEOPLE
ALLOWED. The result is a 3-5 page paper, double spaced, Times New Roman size 12
font, using in-text citations and a reference list, and completed by Novembe

Statistics 311
Week 5
Notes for In-class Activity
Problem 1
A large aircraft company buys metal rods that are part of an assembly in their airplanes. The
specifications for the rods require that the lengths have an average of 3000mm and have a standard
de

Chapter 3 Assignment
Problem I: (3 pts) Beginning with Step #1, place each of the described steps in the correct order in which
they should occur in the accounting cycle. Note: These steps may be more detailed in their wording than the
chapter reading. Se

Chapter 11 Graded Assignment
Problem I: (30 pts) Indicate whether each of the following statements is true (T) or false (F).
a.
_
Privately held corporations tend to have more stockholders than publicly held ones.
b.
_
Only individuals may qualify as stoc

Acc 210
Chapter 1 and Chapter 2 Graded Assignment
Students: Please read the following directions regarding graded assignments this semester.
For maximum success, assignments to be submitted for a grade should be completed after you have
completed the chap

Overview 2 Solutions
Chapter 4
17.
a. Median will probably be unaffected. The mean will be larger
b. The range and standard deviation will increase; IQR will be unaffected.
21. The mean and standard deviation because the distribution is unimodal and symme

Types of Sampling
Probability Sampling:
Technique in which every unit/element of the
population will have a known non-zero probability
of selection
Should be representative and unbiased
Simple Random Sampling:
Each element in the population has an equa

Simple Linear Regression Review
1. review of scatterplots and
correlation
2. review of least squares
procedure
3. inference for least squares lines
1
Simple Linear Regression Review
1. review of scatterplots and
correlation
2. review of least squares
proc

Inference for
Means: Part 2
Type II Error, Power and
Sample Size Calculations
1
Alpha Levels: a Threshold for the P-value
Sometimes we need to make a firm decision about
whether or not to reject the null hypothesis.
When the P-value is small, it tells u

Inference for a Population
Mean
Estimation
Hypothesis Testing
Confidence Intervals and
Hypothesis Tests for a
Population Mean ; t
distributions
t distributions
Confidence
intervals for a
population mean
Sample size
required to
estimate
Hypothesis te

ST 312
PRACTICE PROBLEMS FOR EXAM 1
Reiland
Topics covered on exam 1: numerical summaries, normal models, sampling distributions
for B, inference for .
This material is covered in webassign homework assignments 1 through 4 and worksheets 1-5.
Exam informa

Inference for the difference
Between 2 Means
Comparing Means:
Confidence Intervals and Hypotheses
Tests for the Difference between Two
Population Means 1 - 2
1
Confidence Intervals for the
Difference between Two Population
Means 1 - 2: Independent Samples

Sampling Distribution Models
and the Central Limit Theorem
Transition from Data Analysis and
Probability to Statistics
Probability:
From population to
sample (deduction)
Statistics:
From sample to the
population (induction)
Sampling Distributions
Populat

WHEN IS A Z-SCORE BIG?
NORMAL MODELS
A Very Useful Model for Data
= 3 and = 1
0
3
6
8
9
12
X
Normal Models: A family of bell-shaped
curves that differ only in their means and
standard deviations.
= the mean
= the standard deviation
Normal Models
The me

You have a complete and accurate postal mailing list
The people you are surveying have some interest in the topic and are likely
to respond
Your targeted respondents can read and write
You want to give respondents time to consider their answers before
res