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Statistics

Statistics deals with collecting, organizing, and interpreting numerical data. An important aspect of statistics is the analysis of population characteristics inferred from sampling.

36,755 Questions

Who discovered infrared light?

Sir Frederick William Herschel discovered infrared light in an experiment to measure the temperature of different frequencies of light.

How do states calculate average daily attendance allocations for public schools?

NEW ANSWER: Its actually calculated by taking the aggregate attendance (the total number of days every child attended all year) and dividing it by the total number of days in session.

I don't know the answer to this, but I do know that I pressured to currently send my 10 year old daughter to school WITH THE FLU because of the "Average Daily Attendance $$$" that our public school receives. Because she has already used her allotted absences for the period, she MUST attend school, even if sick, or she "will not get credit for her 9 weeks period". Some schools even report the parents to the District Attorney. Never mind that: 1. It is the height of flu season 2. She is going to school WITH THE FLU and thereby reinfecting other students 3. She makes STRAIGHT A'S Dontcha just LOVE public schools?!!)))))))))))) Well, that may be the case. Do you know that every time they do a head count and your child is not there, they lose up to five thousand dollars? So, if you take each person that misses, approx. 30 or more, and multiply by five thousand, you have $150,000. So next time you talk crap about the public schools, keep that in mind. Each time your little child stays home, that is another dollar they could have gave me a raise with or bought better books for your child.

What is the importance of Swapping two variables?

Suppose we ask the user to enter a range with an upper and lower limit. We would naturally expect the upper limit to be higher in value than the lower limit. If this is not the case, we can either reject the values and ask for new input or we can simply swap them.

if we have an array of unsorted values and we wish to sort them, we need to exchange values. In order to exchange any two values we must swap them.

What is the difference between statistician and a probabilist?

I'm not sure a probablist is a correct term. I would like to consider the difference between a statistician and a specialist in probability theory.

The short answer is the statistician works with data while the specialist in probability theory works more with individual assumed or known probabilities.

Here's the longer answer:

The statistician typically is seeking to draw conclusions from collected data. The discipline of statistics includes all phases of a study, from design, collection, analysis, and presentation. A statisician however, may also try to improve the methods of analysis, so he will be involved in probability theory.

The statistician may work in many fields, including medicine, epidemiology, pharmacy (tests of new drugs), engineering, insurance, sociology, marketing.

The specialist in probability theory (or probability theorist) may draw conclusions from an understanding or reasonable assumptions of the outcome of a system or probability of events from an understanding of the probability of underlying components.

This might sound a bit complicated, but the specialist can tell you how much you can expect to lose if you play the lottery, or any other game of chance. He does this by knowing the probabilities of the underlying event of chosing a winning number.

The related link mentions two area of applications: risk analysis and commodities trading. More broadly, the areas of probability analysis using both Monte-Carlo simulation and analytical means, have applications in many areas environmental systems, operations research applications, valuation of financial derivatives involving risk, and more recently, stochastic simulation of chemical reactions and bioinformatics (computer related work with DNA).

Please check the related links. You can find much more from links on the internet.

What is the difference between the words 'examine' and 'test'?

Examine is the same thing as saying observe, or look at. Test means you find out what happens when you combine or add something to an element or mixture.

Is there any time a secondary source might be more useful than a primary source?

  • Usually you will need 'the broad picture' and a primary source won't give you that.
  • Making sense of primary sources is often extremely difficult without expert knowledge of the subject.
  • Primary sources are easily misunderstood.

If z value is greater than the values given in standard normal distribution curve table what value should be taken?

If the z value is that great the probability of the event is ridiculously small (or large) and you'd have to act as if it were near enough zero (or 1)

What numbers come out more often in the four digit Massachusetts numbers game?

If any 1 or more numbers come up significantly more often than any others

over the long run, then the game is not an honest game.

What is the Sample space for 4?

In order to determine the sample space, an actual description of the problem is needed. A number doesn't give the required information.

How do you make dice roll a certain number?

You don't. The rolling of dice is a uniformly random proposition. Cheating at dice is illegal, and WikiAnswers does not give information about illegal activity.

How many people do rhinos kill each year?

Rhinos are not typically aggressive towards humans and are not known to kill people regularly. In fact, incidents of rhino attacks on humans are rare. While exact numbers can vary, it's estimated that rhinos cause only a handful of fatalities each year, often in cases where people have provoked or threatened them. Overall, they are much more at risk from human activities than the other way around.

What does uncensored mean?

This usually means that the content does not have any blocks on it. Censorship is the act of removing or editing content considered objectionable according to certain standards. If content is "Uncensored" that means that previous editing in order to make the content "acceptable" will be reversed and ALL orgininal parts of the content would be as if it never was edited.

To simplify, Cursing is no longer bleeped, Human body parts being displayed will no longer be checkered or censor bared, and racial slurs will no longer be changed to acceptable language.

What is the law of averages on a multiple choice test?

I remember, in college, reading a study where someone took tens of thousands of multiple-choice tests from different disciplines and studies. The result was that, on a standard 4-choice test, the letter "C" came up more than 28% of the time as an answer.

This was due to "writer's bias," and the author assumed it was because the letter "C" - or the third choice - would "be hidden" as a selection.

A small deviation from 25%, sure, but now, as a high-school teacher and an Ohio graduation test-prep tutor, I tell my kids that, if they come across a question where they absolutely can't use deduction and/or find an educated guess (e.g., "What is the capital of Mongolia?" with 4 similar answers), to pick the letter "C" - you have at least a 1 in 4 chance of being right, and if you consistently pick "C" in these circumstances (hopefully only once or twice per test!), you have a slightly mathematically higher chance of getting that question right... maybe only a fraction higher, but at that point, "Play the numbers!"