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# Ram Singh

Standard Deviation Formula Know More About How to Calculate Standard Deviation Standard Deviation Formula Standard deviation is a widely used measure of variability or diversity used in statistics and probability theory. It shows how much variation or "dispersion" exists from the average (mean, or expected value). A low standard... More

Z Score Chart Know More About Stem and Leaf Plot Z Score Chart Use this chart to find the area under a normal curve when finding An approximation for a binomial distribution. Negative z-score - value is to the left of the mean. Positive z-score - value is to the right of the mean. Negative Z Scores Chart, Normal Distribution Table... More

Z Score Chart Know More About Stem and Leaf Plot Z Score Chart Use this chart to find the area under a normal curve when finding An approximation for a binomial distribution. Negative z-score - value is to the left of the mean. Positive z-score - value is to the right of the mean. Negative Z Scores Chart, Normal Distribution Table... More

Z Score Table Know More About Ogive Z Score Table Definition of the Standard Normal Distribution The Standard Normal distribution follows a normal distribution and has mean 0 and standard deviation 1 Notice that the distribution is perfectly symmetric about 0. If a distribution is normal but not standard, we can convert a value to the... More

Frequency Tables The frequency of a particular data value is the number of times the data value occurs. For example, if four students have a score of 80 in mathematics, and then the score of 80 is said to have a frequency of 4. The frequency of a data value is often represented by f. A frequency table is constructed by arranging... More

Graphing a Circle Definition of Circle Graph A Circle Graph is a graph in the form of a circle that is divided into sectors, with each sector representing a part of a set of data. Example of Circle Graph In the example shown below, the circle graph shows the percentages of people who like different fruits. Each sector in the circle... More

Graphing Lines Graphing linear equations is pretty simple, but only if you work neatly. If you re messy, you ll often make extra work for yourself, and you ll frequently get the wrong answer. I ll walk you through a few examples. Follow my pattern, and you should do fine. Graph y = 2x + 3 First, you draw what is called a "T-chart":... More

Lower Quartile Definition of Quartiles Quartiles are values that divide a set of data into four equal parts. More about Quartiles A data set has three quartiles: the lower quartile, the median of the data set, and the upper quartile. Median: The median divides a data set into two equal parts. Lower quartile: Median of the lower half... More

Omitted Variable Bias In statistics, omitted-variable bias (OVB) occurs when a model is created which incorrectly leaves out one or more important causal factors. The bias is created when the model compensates for the missing factor by over- or under-estimating one of the other factors. More specifically, OVB is the bias that... More

Mean Definition Statistics deal with data analysis. The condensation of data is the first step in rendering comprehensible a long series of individual observations. This was made possible by classifying and tabulating the data and then presenting it in the form of frequency distributions. Once the frequency distributions are formed,... More

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