What is the distribution shape of IQ scores?
In the population, the mean IQ is 100 and it standard deviation, depending on the test, is 15 or 16. If a large enough random sample is selected, the IQ distribution of the sample will resemble the Normal curve. The large the sample, the more clear the pattern will be.
What is the top 2% of IQ scores?
132 or higher
A score of 130 or higher signals a high IQ. Membership in Mensa, the High IQ society, includes people who score in the top 2 percent, which is usually 132 or higher.
What IQ is 70 percentile?
2
IQ percentile chart
| IQ score | IQ percentile |
|---|---|
| 50 | 0.04 |
| 60 | 0.4 |
| 70 | 2 |
| 80 | 9 |
Is IQ normally distributed?
e.g. IQ is normally distributed (mean = 100, SD = 15). 68% of people have IQs between 85 and 115 (100 +/- 15). 95% have IQs between 70 and 130 (100 +/- (2*15). 99.7% have IQs between 55 and 145 (100 +/- (3*15).
What is the 95% rule?
The 95% Rule states that approximately 95% of observations fall within two standard deviations of the mean on a normal distribution.
What does the 68 95 99 rule work?
The 68-95-99 rule It says: 68% of the population is within 1 standard deviation of the mean. 95% of the population is within 2 standard deviation of the mean. 99.7% of the population is within 3 standard deviation of the mean.
What is the normal distribution of IQs?
That means that a measure of IQs across the overall population looks like a bell curve. This is a normal Gaussian distribution. The average IQ is 100, and approximately 95% of the overall population. measures between 70 and 130 (within 2 standard deviations of the mean). The most common score is 100, with high and low scores less common as.
What is the distribution of the IQ bell curve?
The distribution of the scores on these tests fall uniformly from each side of the mean and form what is known as the IQ bell curve. This distribution of scores is known as a standard distribution, seen in the graph below of the score distribution for the Wechsler intelligence tests. The meaning of the IQ bell curve
What is the standard deviation of an IQ test?
An IQ test score is calculated based on a norm group with an average score of 100 and a standard deviation of 15. The standard deviation is a measure of spread, in this case of IQ scores.
What does it mean if my IQ is in the range?
This range shows you that your score may vary within this IQ scale, due to error of measurement and because circumstances under which you take a test might be of influence. The average IQ score is always 100, and your personal score tells you your IQ ranking compared to that.