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 |
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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 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...

...
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...

...may help to start with a definition. By ‘defence of Australia’ I mean the idea
that the principal function of the ADF, and the core basis for choosing its
capabilities, is the defence of the Australian continent from direct military attack,
and in particular the ability to do so against any credible level of attack without
relying on the combat forces of our allies—the self-reliant ‘defence of Australia’.
This idea began to evolve at the time of the SDSC’s foundation in the mid to late
1960s, and was further developed during the 1970s and 1980s, finding its most
complete expressions in the policies of the 1986 Dibb Review and the 1987
Defence of Australia. But there was nothing new in the idea that the defence of
the continent was one of the key questions for Australian defence policy, or that
our defence policy would hinge around choices between a narrow continental
view of Australian strategic interests and objectives and a broader view. The
Commonwealth’s first governments thought that Australia’s naval and military
forces should be able to defend the continent, at least from limited attacks, and
they designed the early Army and Navy accordingly.1 Still, this emphasis faded
after 1914, and the idea of defending Australia did not return to the centre of
Australian defence thinking until the collapse of the ‘forward defence’ posture
in the 1960s.
‘Forward defence’ is often seen as a product of the imperial or global tendency
in Australian...

...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...

...Nicolas, Fatima May D.
2014 45876
My Math Experience
When I was younger math was my favorite subject, it was something that I felt very confident
with. Unlike english, history, and literature, where I had to exert extra effort, math was the only
subject that really came naturally to me. I remember when I was a kid my dad would test me on math questions, usually about lines and figures. What kind of line intersects, what are parallel
lines? I was probably about 7 years of age, and it really impressed family friends when the
answer was correct.
In school, I always did well in math especially basic math, it was simple and it was easy.
Back then, I still have the capacity to help out other students and I was always helping out
friends with their assignments. I always got high grades on tests and I was usually done first
when it came to exams. It was really up until I started high school. Then, algebra happened, since
we didn’t have any lessons given regarding algebra (even the most basic ones) during elementary
I didn’t understand a word the teacher was saying, it was like I was reading a different language.
It was hard at first because I for one like solving problems with numbers but when it started
involving letters I knew I had to work harder because it would be different than what we have ...

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