Question

There are several methods of displaying and exploring data. What are the most useful to use and interpret? Why?

Answer 1

DOT PLOT::-

A dot plot groups the data as little as possible and the identity of an individual observation is not lost.

To develop a dot plot, each observation is simply displayed as a dot along a horizontal number line indicating the possible values of the data.

If there are identical observations or the observations are too close to be shown individually, the dots are “piled” on top of each other.

STEM AND LEAF METHOD::-

Stem-and-leaf display is a statistical technique to present a set of data. Each numerical value is divided into two parts. The leading digit(s) becomes the stem and the trailing digit the leaf. The stems are located along the vertical axis, and the leaf values are stacked against each other along the horizontal axis.

Advantage of the stem-and-leaf display over a frequency distribution - the identity of ach observation is not lost.

SKEWNESS::-

measures of central location (the mean, median, and mode) for a set of observations and measures of data dispersion (e.g. range and the standard deviation) were introduced

Another characteristic of a set of data is the shape..

There are four shapes commonly observed: – symmetric, positively skewed,negatively skewed, bimodal.

CONTINGENCY TABLES::-

A contingency table is a cross-tabulation that simultaneously summarizes two variables of interest..

--among all the methods standard deviation is the best method to use and interpret the data.

because,it is used for the skewness and determination of histograms etc....