Q:
# How do you determine if data is normally distributed?

Data that is normally distributed can be represented on a bell-shaped curve. When data is distributed normally, it skews heavily towards a central value with little bias to the left or right. With normally distributed data, the mean, median and mode are equal. There is symmetry in the center, with 50 percent of values less than the mean and 50 percent of values greater than the mean.

Continue Reading
Credit:
teekid
E+
Getty Images

Normal distribution of data is a popular concept used in the field of social sciences. It is best suited for data that meets several conditions. First, there must be a strong tendency for data to take on a central value. Second, there must be an equal likelihood of positive and negative deviations from this value. Finally, the frequency of the deviations must fall off rapidly while moving away from the central value. Unlike other distributions, such as the logistic and Cauchy distributions, the likelihood of having extreme values that deviate from the central data value are rare. Because of this, some argue that normal distribution does not best represent real-world data, and many human activities display extremely skewed distributions. Normal distribution is good for symmetric data unless there is a likelihood of extreme values. Human height and measurement errors follow normal distribution.

Learn more about Statistics-
Q:
## What is a z test?

A: A Z-test is commonly used in statistics to determine whether a given hypothesis is true in a normal distribution or bell curve. Z-tests are optimal for sam... Full Answer >Filed Under: -
Q:
## How do outliers affect mean, median, mode and range in a set of data?

A: A mathematical outlier, which is a value vastly different from the majority of data, causes a skewed or misleading distribution in certain measures of cent... Full Answer >Filed Under: -
Q:
## What is the purpose of descriptive statistics?

A: In mathematics, the purpose of descriptive statistics is to describe the properties of data samples and measurements in a simpler way. It forms part of qua... Full Answer >Filed Under: -
Q:
## What is percent deviation?

A: Percent deviation is a number calculated to determine the accuracy of data collected during an experiment compared to the theoretically expected results. P... Full Answer >Filed Under: