This site is a part of the JavaScript E-labslearning objects for decision making. Other JavaScript in this series are categorized under different areas of applications in theMENUsection on this page.

The following JavaScript performs the Bayesian inference by combining the sample information with prior information to estimate the mean of a normal population.

Suppose that we draw a random sample x1, x2,....xn of size n from a normal (m, s

^{2}) population. We then take the sample mean as our estimate of m and sample variance as our estimate of s^{2}.Notice that before using this JavaScript it is necessary to perform the Test for Normality.

In the Bayesian inference we have also prior information on m. This is expressed in terms of a probability distribution known as the

prior distribution. Suppose that the prior distribution is normal with mean m_{0}and variance s_{0}^{2}, we now combine this with the sample information to obtain what is known as the posterior distribution of µ. This distribution is normal with posterior mean and variance.Enter your up-to-80 sample data, a confidence level, a prior value for the mean and the variance, and then click the

Calculatebutton. Blank boxes are not included in the calculations but zeros are.In entering your data to move from cell to cell in the data-matrix use the

Tab keynot arrow or enter keys.To edit your data, including add/change/delete, you do not have to click on the "clear" button, and re-enter your data all over again. You may simply add a number to any blank cell, change a number to another in the same cell, or delete a number from a cell. After editing, then click the "calculate" button.

For extensive edit or to use the applet for a new set of data, then use the "clear" button.

For Technical Details, Back to:

Statistical Thinking for Decision Making

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Professor Hossein Arsham

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