Slovin's Formula Sampling Techniques
* By Steph Ellen, eHow Contributor
* When it is not possible to study an entire population (such as the population of the United States), a smaller sample is taken using a random sampling technique. Slovin's formula allows a researcher to sample the population with a desired degree of accuracy. It gives the researcher an idea of how large his sample size needs to be to ensure a reasonable accuracy of results. * When to Use Slovin's Formula

* If a sample is taken from a population, a formula must be used to take into account confidence levels and margins of error. When taking statistical samples, sometimes a lot is known about a population, sometimes a little and sometimes nothing at all. For example, we may know that a population is normally distributed (e.g., for heights, weights or IQs), we may know that there is a bimodal distribution (as often happens with class grades in mathematics classes) or we may have no idea about how a population is going to behave (such as polling college students to get their opinions about quality of student life). Slovin's formula is used when nothing about the behavior of a population is known at all. * How to Use Slovin's Formula

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Slovin's formula is written as:

n = N / (1 + Ne^2)

n = Number of samples
N = Total population
e = Error tolerance

To use the formula, first figure out what you want your error of tolerance to be. For example, you may be happy with a confidence level of 95 percent (giving a margin error of 0.05), or you may require a tighter accuracy of a 98 percent confidence level (a margin of error of 0.02). Plug your population size and required margin of error into the formula. The result will be the number of samples you need to take.

For example, suppose that you have a group of 1,000 city government employees and you want to survey them to find out which tools are best suited to...

...- Politeness formulas in Arabic:
When talking about politeness formulas in Arabic and in English and how they are different, it is crucial to take into account the distinction between propositional content of a formula and its illocutionary force potential. A good example showing the relationship between semantic content or propositional content and illocutionary force illustrates in using congratulations in English and “shukran” in Arabic which is equivalent to “thanks”. Sometimes illocutionary force is not completely predictable, but simply can be learnt by what people agree upon. For instance, there are three expressions in Arabic performing different forces according to the matter of conventions; \baraka-allahu-fik\ “God bless you” is used to perform the act of thanking, whereas \barakafik\ “blessing in yourself” has a different force, addressing the family members and the relatives of the deceased. \mabruuk\ “blesses” is another formula used for congratulations of marriage or success in examinations.
There are many other expressions used by Arabs in one of the earliest means of demonstrating politeness in a second language which are” greetings”. Greetings actually are the first task one should know when learning a new language. In Arabic greetings; for example, one would not restrict themselves to say \ahlan wa sahlan\ “hello” rather they would precede it by \marhaba\ “welcome” and they may...

...CYPOP2-5.3 Evaluate the benefits of different types of formula that are commonly available
Breast milk is a natural form of baby food which is perfect for a baby. But there are some people who for different reasons can’t breastfeed, or have chosen not to, formula milk is the next best thing.
Scientists and medical experts have spent years developing high-quality formula milks that will provide babies with the specific nutrition that they need.
There are many different types of formula feed and there are many different factors to take into account before choosing the right formula feed.
* Health
* Dietary needs
* Age
* Cost and preparation time of different formula milks.
There are three different types of formula:
* Cow’s milk-based formula
* Hydrolysed protein formula
* Soya-based formula
Most babies can have cow’s milk-based formula, however there are some who have a health or dietary reason why they can’t.
The different range of formula milks are described below.
(information obtained from the baby centre website)
Cow’s milk-based formula
Most baby formula milks are based on cow's milk, which is modified to resemble breastmilk as closely as possible. Manufacturers modify cow's milk for babies by adjusting carbohydrate,...

...Marketing Research Project
Pricing strategy for ‘Formula One India Racing Event’ for Retail Customers
Table of Contents
1. Marketing Research Objective: 3
2. Introduction 3
3. Mode of survey 5
4. Survey Questionnaire 6
5. References 8
1. Marketing Research Objective
What should be optimal price for different classes of tickets at ‘Formula One India Racing Event’ for Retail Customers?
1. Introduction
Formula One is the highest class of single seated auto racing authorized by the Fédération Internationale de l'Automobile (FIA). The F1 season consists of a series of races, known as Grand’s Prix held on purpose-built circuits and public roads. The results of each race are combined to determine two annual World Championships, one for the drivers and one for the constructors. The sport is a massive television event and each race is watched by over 600 million people around world.
Europe is Formula One's traditional centre, where all of the teams are based, and where around half of the races take place. However, the sport's scope has expanded significantly in recent years and Formula one event are being organized in several Asian countries including China, Turkey, Singapore, South Korea. More recently, Indian Grand prix has been announced. The first Indian Grand Prix’s race will be held at the Jaypee International Race Circuit in Greater Noida on October 30, 2011. The 5.14 km...

...The Euler’s Formula
Euler’s formula and Identity: eix = cos(x) + i(sin(x))
The world of math today is one with endless possibilities. It expands into many different and interesting topics, often being incorporated into our everyday lives. Today, I will talk about one of these topics; the most mind-blowing and fascinating formula invented, called the “Euler’s formula”. This formula was created and introduced by mathematician Leonhard Euler. In essence, the formula establishes the deep relationship between trigonometric functions and the complex exponential function.
Euler’s formula: eix=cos(x)+isin(x); x being any real number
Wow -- we're relating an imaginary exponent to sine and cosine! What is even more interesting is that the formula has a special case: when π is substituted for x in the above equation, the result is an amazing identity called the Euler’s identity:
eix=cos(x)+isin(x)
eiπ=cos(π)+isin(π)
eiπ= -1+i(0)
eiπ= -1
Euler’s identity: eiπ= -1
This formula is known to be a “perfect mathematical beauty”. The physicist Richard Feynman called it "one of the most remarkable, almost astounding, formulas in all of mathematics." This is because these three basic arithmetic operations occur exactly once each: addition, multiplication, and exponentiation. The identity also links five fundamental mathematical...

...Breastfeeding vs. Formula
Deciding whether to breastfeed or provide formula milk is a major decision amongst new mothers. As simple as it may seem, the decision to breastfeed versus formula feed babies can be difficult and one of the most important decisions a mother can make. While there is nothing wrong with giving babies formula milk, breastfeeding should be the number one choice for mothers. As breast milk provides more nutrients, is naturally produced by mothers and is less expensive, breastfeeding is more beneficial than formula milk.
When examining the benefits of breastfeeding as opposed to formula milk, breast milk tops the list with the nutrients and antibodies it provides. As breast milk contains antibodies that formula milk does not, this provides extra protection for babies against diseases and viruses. The first milk a baby receives while breastfeeding is colostrum. Colostrum is rich in nutrients and the mother’s own disease-preventing antibodies which may protect the baby from certain viruses (Kutner, 2012). Thus, breastfeeding babies contribute to building babies’ immune systems. As the breast milk matures, “the cells, hormones, and antibodies [in breast milk]…protect babies from illness” (Womenshealth.gov, 2011). This combination is unique to breast milk and is not contained in formula milk. On the other hand, some...

...Formula 1: Delivering the F1 Experience
1. Give examples of needs, wants, and demands that F1 fans and sponsors demonstrate, differentiating each of these three concepts. What are the implications of each on F1’s actions?
A lot of people, especially men, relieve their stresses through watching sports or playing sports. Through F1, fan and sponsors are able to relieve their stresses by meeting radical feelings such as fun, excitement and enjoyment. In addition, they want to fulfill their feelings by watching the world best cars racing with dynamic and unexpected incidents. Given their needs and wants, F1 provides their fans and sponsors a totally involving experience by allowing them to have abundant information of everything in the circuit at any time. Also, it gives fans and sponsors more fun and excitement by holding races in different places and different time.
2. Detail all facets of the F1 product. What is being exchanged in an F1 transaction?
F1 focuses on building the right relationships with right customers by providing customer the blend of live racing events, abundant media coverage, and compelling websites. On F1 official web site, fans can book their race tickets, flights, hotels, ground transportation easily. Also, they can easily get access to glut of information, entertainment and forum of such as in-depth news, driver bios, background information, photo gallery, and a merchandise store in its engaging and unofficial websites....

...in the followings:
a) 65 Zn b) cobalt-60 c) sodium d) 52 Cr3+ e) 130 I-
2. For each of the following elements, write its chemical symbol or name, and indicate the type and group to which it belongs:
a) potassium b) arsenic c) iodine d) iron e) Ca
3. Determine the empirical formulas for the following compounds:
a) C6H10O2 b) Si3O9 c) N2O4 e) CH4 f) S4N4
4. Predict the charges of the ions of the followings:
a) Al b) OH c) O d) SO4 e) HSO3 f) ClO
5. Predict the empirical formula for the ionic compounds formed by followings:
a) Ca2+ , PO43- b) K+ , NO3− c) Al3+ , OH− d) Ba2+ , HCO3−
6. Predict whether each of the following compound is molecular or ionic:
a) NaClO b) NOCl c) CoCO3 d) SCl2 e) AlN
7. Give names or chemical formulas for the following acids:
a) H2S b) Nitric acid c) perbromic acid d) HI
e) H2SO3 f) HClO2 g) Acetic acid h) HCN
8. Provide names or chemical formulas for the followings:
a) Cr(NO3)3 b) silver nitrate c) Cr2O3 d) Fe(NO2)2
e) Lead(IV) acetate f) dinitrogen trioxide g) S4N4 h) KClO
9. Give a chemical formula or name for the followings:
a) chlorate ion b) oxide ion c) barium ion d) hydrogencarbonate ion
e) HSO3- f) S2- g) Fe3+ h) H3O+
10. Naturally occurring magnesium has the following isotopic abundances:
Isotope Abundance Mass...

...calculate:
-empirical/molecular formulas
-mass, moles, and molecules relationships
In all calculations that follow, SHOW ALL WORK AND USE SIGNIFICANT FIGURES.
1. Write Avogadro’s number in standard and in scientific notation.
2. What is a mole?
3. (a) In your own words, what is molar mass?
(b) Find the molar mass of the following:
Fe CCl4 Al2(CO3)3
4. Perform the following conversions.
a) Determine the number of atoms in 3.75 mol Fe.
b) How many moles of CaCl2 contain 1.26x1024 formula units of CaCl2?
c) Determine the number of moles of arsenic in 1.90 g As.
d) Calculate the mass in grams of 42.5 mol of potassium cyanide (KCN).
e) Determine the mass in grams of 5.65 x 1024 atoms Se (hint: 2 steps)
5. What is the percent composition by mass of each element in:
a) Water (H2O)
b) glucose (C6H12O6)
6. Define what an empirical formula is and give an example.
7. Define what a molecular formula is and give an example.
8. What is the difference between an empirical and a molecular formula?
9. A compound is 82.6 % C and 17.4 % H.
a) What is the empirical formula for this compound?
b) Its...