You are a statistician hired by a company owner for data analysis of employee records. For your first assignment, the owner wants you to find and compare data for full-time employees in the sales department and full-time employees in the advertising department.

|Name: fernando pirela |Date: 05/26/12 | |Score |
| |

You will find the necessary employee data in the Excel spreadsheet titled Company Data. Download and open the spreadsheet, which lists data for all full-time employees. Employees 001 through 014 are all the employees in the sales department and employees 045 through 062 are all the employees in the advertising department.

(10 points)

Find and compare the mean salaries and mean ages of the employees in the sales and advertising departments. Explain to the owner how these values could be misleading.Answer:

sales department

the mean for the salaries of the sales department is : 42.5

the mean for the ages os the sale department is : 33.8

advertising department

the mean for the salaries of the advertising department is: 45.3

the mean for the ages of the advertising department is : 42.1

(20 points)

Find and compare the standard deviations of the salaries and ages of the employees in the sales and advertising departments. Tell how you would you explain the meaning of these values when you present them to the owner.Answer:

sales department

the deviations for the salaries of the sales department is:16.6

the deviations for the ages of the sales department is: 7.1

advertising department

the deviation for the salaries of the advertising department is: 17.6

...between mating surfaces in relative motion (fretting) exacerbates wear of frictional forces. Bearing seizure or failure may result from excessive wear due to work of friction. As surfaces are worn by work due to friction, fit and surface finish of an object may degrade until it no longer functions properly.
Friction is an important factor in many engineering disciplines such as transportation and measurement. For transportation, automobile brakes inherently rely on friction, slowing a vehicle by converting its kinetic energy into heat. Incidentally, dispersing this large amount of heat safely is one technical challenge in designing brake systems. For measurement, a tribometer is an instrument that measures friction on a surface and a profilograph is a device used to measure pavement surface roughness. Friction is also used to heat and ignite matchsticks.
Anybody that moves, in one way or another, experiences an opposing force either from air or from another body in contact. This force tends to retard the motion of the body. The presence of friction between contact surfaces generates sound, light, and heat energy. It is also referred to as the retarding force or even drag force in the form of air resistance.
Frictional force is found to be directly proportional to the normal force (N) which is mathematically expressed as:
f ∝N
f=kN (Equation 1)
The coefficient of friction (µ) takes the place of k which is the constant of proportionality....

...representation and terms. Puffs are statements that have no legal effect whatsoever. They tend to be statements which are vague because of imprecision or exaggeration.
On the other hand, a representation is a statement made before or at the time a contract is formed concerning some matter relating to the contract. Before the contract was signed by Stylish, he had various meetings with Beauty and asked Beauty whether the price of the house included curtains, blinds and window coverings. Beauty then explained that all window coverings were provided for in the contract. However, from Clause 3, window coverings were not provided for in the contract price. This can be a result of misrepresentation.
A misrepresentation is an untrue statement of fact by one party to a contract to the other at or before the time the contract was made, which induces the other to enter into the contract. This statement is not a term of the contract. In this contract, the statement made by Beauty is untrue. All window coverings are not provided for in the contract based on Clause 3. This untrue statement of fact has misled Stylish into the contract with Beauty as he relied on the untrue statement to make his decision.
There are three types of misrepresentation: fraudulent, negligent and innocent. In fraudulent misrepresentation, the person making the statement knows that what he has said is false. If Beauty knew that all the window coverings were not provided for in the contract...

...
PROJECT PART C: Regression and Correlation Analysis
Math-533 Applied Managerial Statistics
Prof. Jeffrey Frakes
December 12, 2014
Jared D Stock
1. Generate a scatterplot for income ($1,000) versus credit balance ($), including the graph of the best fit line. Interpret.
This scatter plot graph is a representation of combining income and credit balance. It shows the income increasing as the credit balance increases. As a result of this data it can be inferred that there is a positive relationship between the two variables. Because of the positive relationship between income and credit balance the best fit line or linear regression line fits the data quite well. The speculation can be strongly made that the customer with the largest income will, more than likely, have the largest credit balance.
2. Determine the equation of the best fit line, which describes the relationship between income and credit balance.
Regression Analysis: Income($1000) versus Credit Balance($)
The regression equation is
Income($1000) = - 3.52 + 0.0119 Credit Balance($)
Predictor Coef SE Coef T P
Constant -3.516 5.483 -0.64 0.524
Credit Balance($) 0.011926 0.001289 9.25 0.000
S = 8.40667 R-Sq = 64.1% R-Sq(adj) = 63.3%
Analysis of Variance
Source DF SS MS F P
Regression 1 6052.7 6052.7 85.65 0.000
Residual Error 48 3392.3 70.7...

...
PROJECT PART B: Hypothesis Testing and Confidence Intervals
Math-533 Applied Managerial Statistics
Prof. Jeffrey Frakes
December 8, 2014
Jared D Stock
A.) The average (mean) annual income was greater than $45,000
Null Hypothesis: The average (mean) annual income is greater than or equal to $45,000.
Ho: u > $45,000
Alternative Hypothesis: The average (mean) annual income was less than $45,000
Ha: u < $45,000
I will use a = .05 as the significance level, and observing the sample size of n < 30 which tells me I need to use a Z-Test to find the mean of this test and the hypothesis. As the alternative hypothesis is Ha: u < $45,000, the given test is a one-tailed Z-Test.
The critical value for the significance level, α=0.05 for a one-tailed z-test is -1.645.
Decision Rule: We must reject the hypothesis if z >1.645
Test Statistics from Minitab:
One-Sample Z: Income ($1000)
Test of mean = 45, < 45
The proposed standard deviation = 14.64
95% Upper
Variable N Mean StDev SE Mean Bound Z P
Income ($1000) 50 43.48 14.55 2.06 46.86 0.49 0.311
Confidence Intervals from MiniTab:
One-Sample Z
The assumed standard deviation = 14.64
N Mean SE Mean 95% CI
50 42.61...

...the ecosystem.
b. unless the species require different abiotic factors.
c. because of the competitive exclusion principle.
d. unless the species require different biotic factors.
_____ 5. What would likely happen if the population of the bird species shown in the ecosystem in Figure 4–1 were to suddenly decrease?
a. The fish population would decrease.
b. The fish population would increase.
c. The fish population would remain the same.
d. Fish would leave the ecosystem.
_____ 6. A wolf pack hunts, kills, and feeds on a moose. In this interaction, the wolves are
a. hosts. c. mutualists.
b. prey. d. predators.
_____ 7. A symbiotic relationship in which one organism is harmed and another benefits is
a. mutualism. c. commensalism.
b. parasitism. d. predation.
_____ 8. What is one difference between primary and secondary succession?
a. Primary succession is rapid and secondary succession is slow.
b. Secondary succession begins on soil and primary succession begins on newly exposed surfaces.
c. Primary succession modifies the environment and secondary succession does not.
d. Secondary succession begins with lichens and primary succession begins with trees.
_____ 9. A tropical rain forest may not return to its original climax community after which of the following disturbances?
a. burning of a forest fire c. volcanic eruption
b. clearing and farming d. flooding after a hurricane
_____ 10. Which two...

...Yr 10
Mathematics
Assignment
LCR Maths
By Adonis Chigeza
Understanding and Fluency Tasks
Task A
1. y = 1.2𝑥 + 2.57
2. Interpolation: y = -3.43
Extrapolation: y = -8.23
Task B
a) The equation for the path of the ball is h = -0.1t^2 + 0.9t + 1 (h = height, t = time)
b) The vertical height of the ball after 2. seconds2.664m
c) The maximum height reached by the ball is 3.025m
d) The time of with the ball is at maximum height of 3.025 is 4.5 seconds
e) The total time in which the ball was in the air is 10 seconds
f) The two times in which the ball was 1 metre above ground is 0 and 9
Adonis Chigeza 10C
LCR Mathematics
Problem Solving and Reasoning Task
1.
Equation: y = -1.2𝒙2 + 8.4𝒙
a. The bridge is 7 metres wides so therefore it will successfully span the river with 2
metres to spare.
b. If a yacht has a 15 metre mask it will be unable to pass safely under the bridge
because the bridge only has a vertical height 14.7 metres.
Adonis Chigeza 10C
LCR Mathematics
2. Equation: v= -0.2h2 + 2.4h
a. The horizontal distance covered by the rocket when it reached its maximum
height of 7.2 metres was 6 metres.
b. The maximum height reached by the rocket was 7.2 metres.
c. At the horizontal distance of 9 metres from the launch site, there is a 5.2 metre
wall and at that vertical distance, the rocket has a vertical distance 5.4 metre.
That is not taking to account the dimensions of the rocket, however the rocket
cannot have...

...• What were the most revolutionary social and economic developments of the last quarter of the nineteenth century?
• How did different groups of Americans respond to those changes and how effective were their responses?
• What role did government play in these developments?
In the late 1900s some of the most social and economic developments were railroads, steel oil, the type writer cash register, light bulb and agriculture. The development of the railroad made it easier for immigrant to come to this country for work. This meant that there were more group of different races and cultures in America. And in some states there became an over population and city workers like police and garbage men could not keep up with the demand of so many people. Some groups mover to open land for the Homestead Act. They had hope of farming and staying on the land for at least five years as agreed but the supply and demand of agriculture did sustain so many farmer moved off the land well before their five years. The government played many different role I deescalating some issues in American history. Women and children were being worked for long hours and getting paid a little bit of nothing in return for their hard work. So the government put labor laws into place that were to protect women and children. As oil, steel and railroad industries grew so did the levels of pollution. The government again put laws that were to protect animals and the earth so that there would not...

...comparable locations. The chart shows us that the majority of customers are from the urban area, the second highest is suburban, and the lowest amount of customers are from rural areas. One could assume that the department store is in an urban area, which is more accessible for people living in the relative area. This would also address why the second highest is suburban and the least is rural. The farther away or the longer the travel for a customer the less frequent they will visit.
[pic]
The next variable is Income. This variable is quite intriguing. There were a couple of different charts that would have shown this variable but ended up going with a simple bar chart because it shows a good representation of the income classes, however, it appears to be more inconsistent than other variables. This could be explained by the small amount of sample we gathered the information from. It appears to follow a bell shape design. From the chart we can gather that the mean income is about $46,000. The smaller income and higher income customers do not show up as frequently. This tells me that AJ Davis is a middle class department store and its target audience is a person with middle class income.
[pic]
The last variable is Years. Years show us how many years the customer has lived at their location. One could assume that years and location would correlate with their frequency of shopping at AJ Davis. However, when looking at this variable...