# Aj Davis Part B Essay

963 Words Mar 8th, 2013 4 Pages
AJ Davis Department Store

Project Part B: Hypothesis Testing and Confidence Intervals

A. The average (mean) annual income was less than \$50,000

• Null Hypothesis is the average annual income is ≥ to \$50,000. o Ho: µ ≥ 50,000 • Alternate Hypothesis is the average annual income is < than \$50,000. o Ha: µ < 50,000 • Analysis Plan significance level is: a = 0.05 • n > 30 the z test was used to test the hypothesis • Alternative Hypothesis Ha: µ ≥ 50,000, this means the test is a one tailed z test.

Critical Value and Decision Rule • C.V: a = 0.05 the lower tailed z test is 1.645 • D.R: reject Ho if z – statistic is -1.645

Sample Z using Minitab: • Income
The p-value implies the probability of rejecting a true null hypothesis. There is enough evidence to support the claim that the average credit balance for suburban customers is more than \$4300 at a significance level of .05.

The 95% lower confidence limit is 4441. Since the 4300 is smaller than the 95%lower confidence limit we can support the claim that the average credit balance for suburban customers is more than \$4300.

A.

Welcome to Minitab, press F1 for help.

One-Sample Z: I

The assumed standard deviation = 14.55

Variable N Mean StDev SE Mean 95% CI
I 50 43.48 14.55 2.06 (39.45, 47.51)

B.
Test and CI for One Proportion

Sample X N Sample p 95% CI
1 21 50 0.420000 (0.281882, 0.567940)

Test and CI for One Proportion

95% Lower
Sample X N Sample p Bound
1 21 50 0.420000 0.301384

C.
One-Sample Z: Y

Test of mu = 1.645 vs not = 1.645
The assumed standard deviation = 5.103

Variable N Mean StDev SE Mean 95% CI
Y 50 12.380 5.103

## Related Documents

• ###### Essay Math 533 Course Project Part B

AJ DAVIS AJ DAVIS MATH 533 Project Consumer Tel – 123-456-7891 July 21st 2013 MATH 533 Project Consumer Tel – 123-456-7891 July 21st 2013 Lakshan Nanayakkara AJ DAVIS is a department store chain, which has many credit customers. A sample of 50 credit customers is selected with data collected on location, income, credit balance, number of people and years lived in the house Lakshan Nanayakkara AJ DAVIS is a department store chain, which has many credit customers. A sample of 50 credit…

Words: 1485 - Pages: 6
• ###### The On Spare Parts, One Ugly Robot, And The Battle For The American Dream By Joshua Davis

revisions of our essays. All these of have definitely helped me with the writing process and becoming a better writer. For my case study I have chosen my most recent essay, the argumentative piece on Spare Parts: Four Undocumented Teenagers, One Ugly Robot, and the Battle for the American Dream by Joshua Davis, published in 2014. I choose this essay because I feel it exemplifies my best writing. When writing this essay I was able to use all the information we had learned since the beginning of the semester…

Words: 1058 - Pages: 5
• ###### Statistical Report for Aj Davis Department Chain Store Essay

Location 8.0 Conclusion 9.0 References List 1.0 Introduction This report is done base on a sample of 50 credit customers with AJ DAVIS is selected with data collected base on five variables as following: • Location (Rural, Urban, Suburban) • Income (in \$1,000's) • Size (Household Size, meaning number of people living in the household) • Years (the number of…

Words: 1810 - Pages: 8
• ###### John B. Watson & Behavioral Psychology Part 1 Essay

specifically, to psychology as a science. John B. Watson was a well-known behavioral psychologist who contributed to psychology by introducing behaviorism to the field, and pushing for psychology to be known as a science of observable behavior. To fully understand the impact of his role in psychology on the acceptance of psychology as a science, it is important to understand his life and the development of his theory. Personal History & Zeitgeist John B. Watson was born January 9, 1878 near Greenville…

Words: 1790 - Pages: 8
• ###### Essay Aj Davis Department Store Part B

AJ Davis Department Store Part B AJ Davis Department Store Introduction The following information will show whether or not the manager’s speculations are correct. He wants to know the following information: Is the average mean greater than \$45,000? Does the true population proportion of customers who live in an urban area exceed 45%? Is the average number of years lived in the current home less than 8 years? Is the credit balance for suburban customers more than \$3200? Hypothesis testing and confidence…

Words: 887 - Pages: 4
• ###### Aj Davis Statistical Analysis Part a Essay

Data Analysis AJ Davis Project Part A January 18, 2013 Overview of Analysis 3 Individual Variable Analysis 4 Relationship between variables 8 Conclusion 10 Bibliography 11 Overview of Analysis AJ Davis is a department store chain, which has many credit customers and wants to find out more information about these customers. The department store provided a sample of 50 customers. The following data was provided for analysis: 1. Location a. Rural b. Urban…

Words: 721 - Pages: 3
• ###### Part B Example Essay

efforts by Catherine to try and keep the marriage together for the sake of their daughter Mary. It is important to remember that it was not just her determined effort to oppose an annulment that had still prevented an annulment by 1529 she was also part of a strong bloodline with influential people related to her. Catherine had gathered a large amount of support from influential figures by 1529 and still remained convinced that her marriage to Henry was legitimate as she had not consummated whilst…

Words: 1378 - Pages: 6
• ###### Essay Ethical Dilemma Part B. Gladwell Kamaru

Ethical Dilemma Part B Gladwell Kamaru Midamerica Nazarene University Ethical Dilemma Part B Introduction In the previous paper I wrote how I would resolve the ethical dilemma surrounding the case study on Wilma. Upon communications with a licensed professional mental health counselor, reviewing the AMHCA code of ethics as well as the ACA code of ethics, and including moral principles a counselor ought to follow through I made a final decision. The final decision would most likely be determine…

Words: 732 - Pages: 3
• ###### Math533 Part a Essay

PART A- Exploratory Data Analysis Introduction & Overview AJ Davis is a department store chain, which has many credit customers and wants to find out more information about these customers. The total sample set of 50 credit customers is selected with data collected. The below data was provided in order to perform the analysis. 1. Location: a. Urban b. Suburban c. Rural 2. Income 3. Household Size (number of people living in the household) 4. Years (the number of years that the…

Words: 1259 - Pages: 6
• ###### Essay Spare Parts By Joshua Davis

Spare Parts is the story about how four young boys who came together, with the help of their teachers, accomplish something amazing. Throughout Joshua Davis’ story of Spare Parts, there are hints and allusions that combine to form the bigger picture. What makes the story even greater is most people had such little expectations for them since they were illegal immigrants. One of these major themes is the idea of whether it is worth it to put effort into anything, even when the chances of success seem…

Words: 1130 - Pages: 5