Statistics E Commerce

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Statistics help ASAP please!?

A local chamber of commerce is backing a plan for a new convention center. The chamber states that 65 percent of the voters favor the plan, which would raise tourism business and taxes for the residents. 5 of the registered voters in the community are called at random. X is the number of voters called who say they favor the plan. Find the probability that exactly 2 voters sampled favor the plan. Round to 6 decimal places with zero in the units place (i.e. 0.xxxxxx)

Let X be the number of voters who favor the plan. X has the binomial distribution with n = 5 trials and success probability p = 0.65

In general, if X has the binomial distribution with n trials and a success probability of p then
P[X = x] = n!/(x!(n-x)!) * p^x * (1-p)^(n-x)
for values of x = 0, 1, 2, ..., n
P[X = x] = 0 for any other value of x.

The probability mass function is derived by looking at the number of combination of x objects chosen from n objects and then a total of x success and n - x failures.
Or, in other words, the binomial is the sum of n independent and identically distributed Bernoulli trials.

X ~ Binomial( n = 5 , p = 0.65 )

the mean of the binomial distribution is n * p = 3.25
the variance of the binomial distribution is n * p * (1 - p) = 1.1375
the standard deviation is the square root of the variance = √ ( n * p * (1 - p)) = 1.066536

The Probability Mass Function, PMF,
f(X) = P(X = x) is:

P( X = 0 ) = 0.005252187
P( X = 1 ) = 0.04877031
P( X = 2 ) = 0.1811469 <<<< ANSWER
P( X = 3 ) = 0.3364156
P( X = 4 ) = 0.3123859
P( X = 5 ) = 0.1160291

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E Commerce Statistics 2009

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Brazil's Trade Statistics/Results and Top Trading Partners in 2010

As one of the four emerging markets comprising the B-R-I-Cs (i.e., Brazil, Russia, Indian and China), Brazil's trade growth has been unprecedented, and in 2010, its success continued. According to Brazil's Ministry of Development, Industry & Commerce, Brazil's exports increased nearly 32% from 2009 (US$153 billion) to 2010 (US$202 billion), and its imports increased by a whopping 42% during that period from US$127 billion to US$181 billion.

In 2009, for the first time, China became the largest importer of Brazilian products, replacing the United States. This gap increased in 2010, as exports to China increased by over 46% (to US$31 billion) from during that period (comprising 15.2% of Brazil's total exports). Meanwhile exports to the United States increased by nearly 23%, comprising 9.5% of Brazil's total exports. The remaining countries rounding up the top five export markets in 2010 were Argentina, Holland and Germany, comprising 9.1%, 5.0% and 4.0% of Brazil's total exports, respectively.

Brazil has a very strong industrial base. It exports not only natural resources and agricultural products, but also industrial and commercial products. At the top of the list are natural resources (like iron ore)) and agricultural products (like soy beans, coffee and sugar). However, moving down the list, their manufactured products include vehicle parts, airplanes, petrochemical products and ethanol. While China and the United States mainly imported natural resources, Argentina's top import was automobiles.

Meanwhile, in regards to imports, in 2010, both the United States and China again are the top two countries that export to Brazil. The United States is the top country (comprising 14.9% of Brazil's imports) and China came in a close second place (comprising 14.0%). Rounding up the top five countries are Argentina, Germany and South Korea (replacing Japan as number 5), comprising 7.9 %, 6.9% and 4.6% of Brazil's total imports, respectively. Imported products include passenger cars, medicines, vehicle parts, potassium chloride, engines and machines.

A Brazilian-based online directory to find Brazilian companies for business-to-business trade is B2Brazil.com. The service is free to use in order to access, learn about and directly contact Brazilian companies in all industries. Users do not have to register to use the site, just browse, search and contact. B2Brazil.com is the source for trade with Brazil for importers and exporters alike.

About the Author

The author is an investor and entreprenuer and created B2Brazil.com, a B2B marketplace promoting trade and transactions with Brazil, located at http://www.b2brazil.com.  For more information about doing business with Brazil, visit B2Brazil and check out the Resources & Tools area. 

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E Commerce Diagram

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Homework help....Data Flow Diagram?

I need a data flow diagram that represents an online e-commerce system and a 1 page paper that identifies the unique data types that must be stored (entities) in such a system, and the attributes that make up each entity.

I am hoplessly lost in this class....thanks for any help!

<3
J

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at http://askexpert.info/

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