Hypothesis test for the difference between two means
This lesson explains how to conduct a hypothesis test for the difference between two means. The test procedure, called the two-sample t-test, is appropriate when the following conditions are met:
* The sampling method for each sample is simple...
Hypothesis Test
Setting up and testing hypotheses is an essential part of statistical inference. In order to formulate such a test, usually some theory has been put forward, either because it is believed to be true or because it is to be used as a basis for argument, but has not been proved, for example...
Preparing to Conduct Business Research: Part 3
Angela Lopez, Brittney Krause, Barbara Lee, Brandi Weiler, Cherie Greene
RES/351
September 3, 2012
Dean Gualco
Preparing to Conduct Business Research: Part 3
INTRODUCTION
With many of the organizations around problems, dilemmas, and opportunities...
should start with two major cities (around the size of Boston or larger). You wish to draw some conclusions about hotel prices in these cities. You don’t want to collect data on every single hotel in these cities, so you are going to collect sample data in order to test some hypotheses about the whole...
Chi square test for independence of two attributes. Suppose N observations are considered and classified according two characteristics say A and B. We may be interested to test whether the two characteristics are independent. In such a case, we can use Chi square test for independence of two attributes...
Chapter 13: t-Test for Related Samples
Research Question:
Does therapy reduce anxiety?
Measure anxiety levels before and after therapy
Onesample (same people) measured twice
| |Before |After |
|Patient ...
Preparing to Conduct Business Research: Part 3
RES/351
Feasibility of Non Bulk Items at Costco – Part 1
Costco is the greatest wholesale mega store in today’s market opening its first store in 1983 in Seattle, Washington. Its mission statement is "Costco's mission is to continually provide our...
select a random sample and then use the sample values to estimate the value of a population parameter. Recall that a sample is a part or subset of the population, while a parameter is a value calculated from the entire population. In Chapter 9 we estimated a population parameter from a sample statistic. In...
Statistics
A note on basic statistics
Statistics is the practice or science of collecting and analyzing numerical data in large
quantities. So there are two parts1. Collection of Data 2. Analysis of Data- understanding what the data says. Steps in Statistics To carry out any statistical operation, the following...
very broad field and will probably remain this way for a very long time as numerous studies are being conducted by psychologists worldwide to test their hypotheses everyday. However, because of the fact psychology is a very complex field of work; a psychologist will have to undergo some necessary scientific...
The T-TEST
1.0 INTRODUCTION
The t-test was developed by W. S. Gossett, a statistician employed at the Guinness brewery. However, because the brewery did not allow employees to publish their research, Gossett's work on the t-test appears under the name "Student". The t-test is sometimes referred to as...
•€€€€€€€€€How sections constituting this chapter?
3.2 Unit of analysis & sampling strategy
•€€€€€€€€€Who was your target sample or respondents and why?
•€€€€€€€€€How did you sample or recruit the respondents? Probability versus non-probability sampling?
•€€€€€€€€€How many people did you recruit and...
and alternate hypotheses for your hypothesis test
• Determine if your test is one- or two- tailed
• Conduct an appropriate test using Excel in any of three ways
o Using the critical score approach
o Using the non-rejection region approach (for a two-tailed test)
o...
CoffeeTime's management wants to apply different statistical procedures such as multiple regression, Z test for proportions, the chi-square test in order to make informed and appropriate business decisions to meet two key goals (1) strengthen presence in India vis-à-vis competition from Quick Brew (a local coffee...
Outline
What is Business Research?
The Scientific Method
The Research Process
Sample Survey
Questionnaire Design
2
Business Research
What is Business Research?
Research is the systematic and objective process of collecting, recording, describing and
analyzing data to understand a phenomenon...
WRITING A RESEARCH PROPOSAL
Writing a proposal is not an easy task for anyone, and it may be especially difficult if you have not done one before or if you have not done much writing. The job takes diligence, commitment and hard work. But all the hard work is well worth it.
The Format of a Research...
project is about trying to find out what drives someone to join the United States Army. This is a very important subject to me for several reasons. Number one, I am an Army Recruiter and I believe it will help me improve in my profession if I can better understand the reasons that someone joins the Army. Also...
levels of two populations of students at two different colleges. He collects performance data by administering the same midterm exam to one class at each college. He randomly selects 30 students from each class and gets the following results:
College 1 College 2 Difference in
Student Number Test Score...
Chapter 2 answers
2.37
Sample mean = (3.2+2.5+2.1+3.7+2.8+2.0)/6 = 16.3/6 = 2.717
The median is the middle value when the data set is ordered.
Here since we have even number of observations we need to find the average of the two middle values.
Ordered data: 2.0, 2.1, 2.5,...
on ____________ in Daphnia.
(Length: not more than two pages of text in 12-point font, double-spaced; plus one page each for Table 1 and Figure 1.)
Introduction:
• Provide a few sentences of background information on the effects of these two drugs on heart rate in Daphnia or other animals (including...