If you got 8 as a rating and your team member got 7 as the rating, there won’t be much of a difference here, isn’t it?
Then only a few employees got a higher rating, a majority will get an average rating, and a few will get a low rating. When you plot a bell-shaped graph, it shows the highest probability of the outcome, and the probability of the outcome keeps going down when the bell shapes move to either side from the center point.įor example, look at the below Excel bell shapes curve graph.Īssume you are working in a team of 50 members, and your rating is very similar to the other team members. They gauge employees on Low or Non Performers, Average Performers, and High Performers. Using this performance appraisal, they reward employees in terms of salary, promotions, etc. All the organizations work on performance appraisal for a specific period of time frame. read more is the graph that is commonly used to gauge the performance appraisal of employees in companies. It gets its name from the shape of the graph which resembles to a bell. We can plot the standard deviation in the Excel graph, and that graph is called the “ Bell-Shaped Curve.”īell Curve Bell Curve Bell Curve graph portrays a normal distribution which is a type of continuous probability.
T test with mean and standard deviation excel series#
Typically standard deviation is the variation on either side of the average or means value of the data series values. For example, in the stock market, how the stock price is volatile in nature. Standard Deviation is one of the important statistical tools which shows how the data is spread out. As we know that standard deviation is a calculation of how the values are changing with comparison or the respect of the mean or the average value, we represent this data in a graph, there are two deviations represented in graph of standard deviation, one which are positive to the mean which is shown on the right hand side of the graph and another is negative to the mean which are shown on the left hand side of the graph, the standard deviation graph is also known as bell curve graph in excel.
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