Poll Question?

Question

What do skewed, bimodal and bell curve polls indicate? I need to know what each one means and what do they indicate. Please help me with this question.

Answer 1

The other answerer has the first two about right, but he's talking about a specific book called "The Bell Curve" instead of the actual phenomenon.

"Bell curve" is another name for "normal distribution." This refers to statistical results that are concentrated in the middle and drop lower and lower to the extremes on either side - hence forming a curve resembling a bell.

Answer 2

Skewness is a measure of the asymmetry of the probability distribution of a real-valued random variable.

Bimodal distributions are a commonly-used example of how summary statistics such as the mean, median, and standard deviation can be deceptive when used on an arbitrary distribution. The mean and median would be about zero, even though zero is not a typical value. The standard deviation is also very large, even though the deviation of each normal distribution is relatively small.

The Bell Curve is that intelligence is a better predictor of many factors including financial income, job performance, unwed pregnancy, and crime than parent's socioeconomic status or education level. High intelligence (the "cognitive elite") is becoming separated from the general population of those with average and below-average intelligence, and that this was a dangerous social trend. The debate about whether and how much genes and environment have to do with ethnic differences remains unresolved.