## What is SX and ox on calculator?

In other words, σx is the exact standard deviation of the data given (with n in the denominator), and sx is an unbiased estimation of the standard deviation of a larger population assuming that the data given is only a sample of that population (i.e. with n-1 in the denominator).

## What does the upper quartile mean?

The upper quartile (sometimes called Q3) is the number dividing the third and fourth quartile. The upper quartile can also be thought of as the median of the upper half of the numbers. The upper quartile is also called the 75th percentile; it splits the lowest 75% of data from the highest 25%.

## How do you find the interquartile range of even numbers?

We can find the interquartile range or IQR in four simple steps:

- Order the data from least to greatest.
- Find the median.
- Calculate the median of both the lower and upper half of the data.
- The IQR is the difference between the upper and lower medians.

## What is the third quartile in statistics?

The third quartile, denoted by Q3 , is the median of the upper half of the data set. This means that about 75% of the numbers in the data set lie below Q3 and about 25% lie above Q3 .

## What is the third quartile in a box and whisker plot?

The third quartile is the median of the data points to the right of the median.

## What is Q1 in box plot?

Q1 – quartile 1, the median of the lower half of the data set. Q2 – quartile 2, the median of the entire data set. Q3 – quartile 3, the median of the upper half of the data set. Extreme Values – the smallest and largest values in a data set.

## How do you identify outliers in a box plot?

When reviewing a box plot, an outlier is defined as a data point that is located outside the whiskers of the box plot. For example, outside 1.5 times the interquartile range above the upper quartile and below the lower quartile (Q1 – 1.5 IQR or Q3 + 1.5 IQR).

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