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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.

36,756 Questions

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!"

Two spinners one red and blue and the other marked 1 2 3 equally What are the chances of spinning blue and an odd number?

Assuming the red and blue spinner has an equal number of red and blue spots, the odds of spinning blue is 50%. On the other spinner, the odds of an odd number is 67%. Combined, the odds of spinning blue and an odd number is 33%. (50% times 67%)

Why is it often desirable to take samples?

Samples are often used as all possible data could be impractically large to procure.

For instance, if I wanted to find out the average weight of frogs in a lake, I could drain the entire lake, use a chemical spray to immobilise all frogs, and then weigh each one individually, but that would be a mammoth task. Fencing off a section of the lake and taking a sample would be considerably cheaper, less time consuming, and more practical, and would only give us a slightly less accurate result.

Another issue is that people often are unwilling/unable to respond to a survey. If we tried to get the shopping habits of everyone going into a shop, many will be in a hurry or just plain not want to be surveyed. For this reason, the results will end up being incomplete anyway, so the person may as well set clear qualities she wants a sample to have.

What does jaryd mean?

Jaryd means strong, hopeful. A warrior. A gentle lover and friend. One who will make you laugh, and cry.

What is top sample?

"Top sample" typically refers to a sampling method or a specific example that represents the highest quality or the best characteristics of a group. In various contexts, it can denote the most influential, significant, or relevant samples in research, data analysis, or product selection. For instance, in music or art, a top sample might highlight the most celebrated works or styles within a genre.

What does Khadija mean?

khadija is really a very nice noun as Sarra and other names are or may be better

What does an 139 IQ mean?

IQ score meaning
Over 140 - Genius or near genius
120 - 140 - Very superior intelligence
110 - 119 - Superior intelligence
90 - 109 - Normal or average intelligence
80 - 89 - Dullness
70 - 79 - Borderline deficiency
Under 70 - Definite feeble-mindedness

What does irreputable mean?

Its a form of disreputable... As in, not reputable... lacking in respectability... This term means direputable.. As in not reputable... or lacking in respectability...

What is a experimental sample?

An experimental sample is an experiment that is just a sample of what you are looking for.