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To determine how well airline companies serve their customers, a study was
conducted. The results produced the following customer r
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Which of the following statements is not true about hypothesis testing?
Select one:
a. The burden of the proof is always on null hy
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2. Which of the following is an example of nonprobabilistic sampling?
Select one:
A. simple random sampling
B. stratified simple ra
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The average starting salary for graduates at a university is$25,000 with a
standard deviation of $2000. If a histogram of the data
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Lecture: Financial Statistics
Please recall the lecture where descriptive statistics for monthly rate of returns for McDonald's
Corp. and S&P 500 Index were generated and compared. In this section, we
Overview:
This week we are going to extend the idea of hypothesis testing and confidence interval to
situations where we are concerned with difference between two population means. Statistical
inferen
Predictive Analysis
Sample Case 1
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Lecture: Statistical Inferences About Means and Proportion
with Two Populations
The prerequisites listed below are
materials used in the process to
conduct tests of hypotheses about one
population par
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Hypothesis Testing about a Population Mean
Methods to Evaluate Test of Hypothesi
Practice Case Study Solution
State University Textbook
Situation:
A large, required chemistry course at State University has been using the same textbook for a number
of years. Over the years, the stu
10/19/2017
Overview, Objectives and Readings
Overview: Chapter 8
Interval estimation is discussed in chapter 8 and is the focus of this week's materials where we are
concerned with computing interval
Lecture: Financial Statistics - Sample Case
Mutual funds are classified as load or no-load funds. Load funds require an investor to pay an
initial fee based on a percentage of the amount invested in t
Lecture: Test of Hypotheses and Confidence Interval About
the Difference Between Means of Two Populations Using tdistribution
Use of t-distributions
Should we ever use z-distribution to
calculate conf
10/19/2017
QM 520 FA2017 VT2: Lecture: Estimation
Lecture: Estimation
Once the decision maker collects representative sample from the population under investigation
then sample statistics need to be g
10/19/2017
Lecture
Lecture: Computing Confidence Intervals Using t-Distribution
Before the discussion on how to compute confidence intervals
using t-distribution, we would need to discuss the concept
10/19/2017
Lecture
Solution
The first issue that Ben needs to make a decision on is determining the confidence level value to
use for the audit study. He recalls from his college statistics course tha
Lecture: Inferences about the Difference between the Means
of Two Populations - Matched Samples
Matched Samples
If you have
related samples,
for example,
before/after, pretest/post-test
designs or if
10/19/2017
Lecture
Lecture: Determining Sample Size for Population Mean
There are situations in decisionmaking process where we must
achieve certain requirements related to
precision (margin of error)
10/19/2017
QM 520 FA2017 VT2: Lecture: Confidence Interval's Precision
Lecture: Confidence Interval's Precision
Sometimes, the range of the
computed confidence interval is so
wide that it does not off
10/19/2017
QM 520 FA2017 VT2: Lecture:Confidence Intervals
Lecture: Confidence Intervals
Statisticians use
confidence interval to
describe the amount of
uncertainty associated
with a sample estimate
o
10/19/2017
Lecture
Lecture: t-Distribution
For majority of the decisionmaking situations, population
standard deviation, s, is not
known and we would need to
reply on sample data (Finite
Sampling) to
Overview
We will introduce the idea of hypothesis testing this week. Hypothesis testing is a very powerful
statistical procedure for decision making. With hypothesis testing, business researchers are
Lecture: Hypothesis Testing
We've dealt with one aspect of statistical inference namely, estimation estimating the unknown population parameter . A sample is
selected, a point estimate, is computed an
Question 1
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Question text
The average starting salary for graduates at a university is$25,000 with a standard deviation of
$2000. If a histogram o
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The sample mean if: is the
point estimator uftha
population