What is the upper quartile in a stem and leaf plot?
The other two values to remember are the lower quartile (LQ), which divides the lower 50% of the data points into two equally sized parts, and the upper quartile (UQ), that separates the higher 50% of the data points into two equally sized groups.
What are upper quartiles?
The upper quartile, or third quartile (Q3), is the value under which 75% of data points are found when arranged in increasing order. The median is considered the second quartile (Q2). The interquartile range is the difference between upper and lower quartiles.
What are upper and lower quartiles?
The lower quartile value is the median of the lower half of the data. The upper quartile value is the median of the upper half of the data.
What does UQ mean in math?
The upper quartile is the value which is three quarters of the way into our data: of the (number of values+ 1) or 3 ( 11 + 1 ) 4 = 9. So the upper quartile (UQ) is 18.
What is the upper quartile of the data?
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%.
Is the upper quartile the same as the third quartile?
A quartile divides data into three points—a lower quartile, median, and upper quartile—to form four groups of the dataset. The second quartile, Q2, is also the median. The upper or third quartile, denoted as Q3, is the central point that lies between the median and the highest number of the distribution.
How do you find the upper quartile in math?
The upper quartile is the median of the upper half of a data set. This is located by dividing the data set with the median and then dividing the upper half that remains with the median again, this median of the upper half being the upper quartile.
What does the leaf unit mean in a stem and leaf plot?
The “leaf unit” at the top of the plot indicates which decimal place the leaf values represent. The first row of the stem-and-leaf plot of Wait times has a stem value of 8 and contains the leaf values 0, 2, and 3.
How do you identify outliers on a stem and leaf plot?
On a stem-and-leaf plot, isolated values at the ends identify possible outliers. For example, on the following stem-and-leaf plot, the last value at the bottom of this plot could be an outlier. Try to identify the cause of any outliers. Correct any data-entry errors or measurement errors.
What is the difference between upper and lower quartile called?
The difference between the lower quartile and the upper quartile is called the interquartile range and corresponds to the 50% of the data points that are in the middle You can use a steam-and-leaf plot to find and display the median, the LQ and the UQ.
What is the minimum sample size for stem and leaf plot?
Because a stem-and-leaf plot represents each data value, it is best when the sample size is less than approximately 50. If the sample is greater than 50, the data points on the plot may extend too far, and the distribution may be difficult to assess.