Statistics

Front

What is the mean in statistics?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

What is standard deviation?

Back

Standard deviation is a measure of the amount of variation or dispersion in a set of values.

Front

How do you calculate +2 standard deviations from the mean?

Back

To calculate +2 standard deviations from the mean, add two times the standard deviation to the mean.

Front

What is the median of a data set?

Back

The median is the middle value of a data set when it is ordered from least to greatest.

Front

How do you find the median when there are two middle numbers?

Back

Add the two middle numbers and divide by 2.

Front

What is normal distribution?

Back

Normal distribution is a probability distribution that is symmetrical and bell-shaped, where most of the observations cluster around the central peak.

Front

What percent of data lies within 1 standard deviation from the mean in a normal distribution?

Back

Approximately 68% of the data lies within 1 standard deviation from the mean.

Front

What is a skewed distribution?

Back

A skewed distribution is one where the data is not symmetrical and tends to cluster more on one side of the mean.

Front

What is the difference between mean and median?

Back

The mean is the average of all values, while the median is the middle value when the data is ordered.

Front

What is a data set?

Back

A data set is a collection of related data points or values.