Answer
The majority (60%) earn less that $5 million; 78% earn less than $10 million; five golfers (10%)
earn between $20 million and $30 million; only Tiger Woods and Phil Mickelson earn more than
$40
18.
NRF/BIG research provided results of a consumer holiday
spending survey (USA Today, December 20, 2005). The
following data provide the dollar amount of holiday spending
for a sample of 25 consume
19.Fortune provides a list of Americas largest corporations
based on annual revenue. Shown below are the 50 largest
corporations, with annual revenue expressed in billions of
dollars (CNN Money websit
Test Statistics for Scenarios
Frank McGrade
September 28, 2016
Sleep scenario, unknown
A random sample of 44 government employees were assigned to a 6-hour work day for a period of 8 weeks.
Over this
Question 1
Normalization is:
Answers:
Done to remvoe scale effects
Done to make each variable start with the same number
Usually performed before principal component analysis
Usually needed before a
Estimation
Frank McGrade
September 12, 2016
Making inferences
Start with a random variable X of interest
and 2 exist as the popn mean and popn variance for X
Interested in making inferences about p
Lecture 14 Part II: Proportions as PDF
Frank McGrade
October 2, 2016
Discrete Data
The test statistics and confidence intervals to this point have dealt with continuous data.
Discrete data: Isolated p
Question 1
What is the lot size and income associated with the below splits?
Answers:
Lot size = 23,000
Income= ~$105,000
Lot size = 21,000
Income= ~$95,000
Lot size = 19,000
Income= ~$85,000
Lot siz
Question 1
For the following dendogram, how many clusters can the data be reduced to
with a cutoff distance of 3.4?
Answ 11
ers:
10
9
8
7
6
5
Question 2
Give any one other term used for each of the fo
Question 1
Based on the below decile chart, how much more likely is the top decile to
identify the important class, as compared to the average prevalence
Answers:
2.5 times as likely
Twice as likely
Question 1
Data mining methods grew out of which 3 fields?
Answers:
Economics
Computer Science
Sociology
Database management
None of the above
Question 2
Please put the recursive partitioning steps in
Normal Approximation for Sample Proportions
The sampling distribution of
is approximately normal with mean p and
standard deviation
if the following conditions are satisfied:
1. A random sample is sel
Discrete Prob. Dist.
Random Variable
Discrete and Continuous
Discrete Probability Distributions
Expected Values and Variance
Binomial Probability Distribution
Poisson Probability Distribution
Continuo
The above is true if the sample size is large enough, usually n greater than
30 is sufficient.
What next?
We have shown that both the sampling distribution of the sample
proportion, and the sampling
Using Economic Fluctuations to Understand the Recent Recession
What Caused the 2007 Recession?
1) Collapse of the housing bubble
The sharp drop in housing sales and prices led to rising
foreclosures,
Sampling Distributions
2 Sept 2016
Standard Normal Distribution
Z
x
What is E(Z)?
What is Var(Z)?
Use the rules for linear combination:
Var ( Z ) b 2 2
E ( Z ) a b
1
0
Z ~ N (0,1)
1
2
1
2
Mice
Ave
Experimental Design
Frank McGrade
August 26, 2016
The Design: Experiments, Observational Studys, Surveys
Experiment-allows the researcher to manipulate one or more of the factors.
Response Variable- v
Crosstabulations and Scatter Diagrams
Crosstabulations and scatter diagrams are used to summarize
data in a way that reveals the relationship between two variables.
Thus far in this chapter, we have f
Cumulative Distributions
A variation of the frequency distribution that provides another
tabular summary of quantitative data is the cumulative frequency
distribution. The cumulative frequency distrib
Apply Tools: The following steps describe how to use Excels
chart tools to construct a histogram for the audit time data using
the frequency distribution appearing in cells C1:D6.
1.
Step 1
Select cel
4049
7
5059
2
Construct a cumulative frequency distribution and a
cumulative relative frequency distribution.
Answer
13.
Construct a histogram and an ogive for the data in exercise
12.
14.
Consider th
1.
A cumulative relative frequency distribution.
2.
What do these distributions tell you about the annual
revenue of the largest corporations in America?
3.
Show a histogram. Comment on the shape of t
17.
The Dow Jones Industrial Average (DJIA) underwent one of
its infrequent reshufflings of companies when General
Motors and Citigroup were replaced by Cisco Systems and
Travelers (The Wall Street J
BA 2300
Excel Assignment 1
Fall 2016
Due Date: October 12, in class
Name: Rania Hassan .
Question 1:
(a) Open the excel file named Excel_Assignment 1 from Blackboard. The worksheet Descriptive
Statist