The data shown has a Mean of 22.352 oC and an associated Standard Error of 0.138.ĭegrees of Freedom is defined as n-1 so since there are 5 data points (n) we have 4 Degrees of Freedom.įrom the t-value table, for 4 Degrees of Freedom, t 95% is 2.776. The 95% Confidence Level is found by multiplying the SE by the appropriate t 95% value, which itself is found from a table of t-Values. However, we want the 95% Confidence Level rather than the SE. The two functions you have used calculate the Mean and the Standard Error (SE) of the Mean.for the data shown you would need to enter =STDEV.S(A2:A6)/SQRT(5) in Cell A9.
Note: In some versions of Excel the STDEV function has been replaced by the STDEV.S function, i.e. In the next cell below enter =STDEV( DataRange )/SQRT( n ) where n is the number of data points.ĮXAMPLE: For the data shown you would enter =STDEV(A2:A6)/SQRT(5) in Cell A9.
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In the cell a couple below the last data value enter the formula =AVERAGE( DataRange ) where DataRange is the cells containing the data.ĮXAMPLE: If the data was in Cells A2, A3, A4, A5 and A6 (as shown in the example image) then you would enter =AVERAGE(A2:A6) in Cell A8.Enter your multiple readings in a column on your spreadsheet.Note: Makes sure you hit after inputting your formulas! Note: It has not yet been possible to test if this solution works for Office Online and versions of Excel prior to 2003.ĭETERMINING THE MEAN WITH ITS ASSOCIATED 95% CONFIDENCE LEVEL However there is an alternative means of performing the core Descriptive Statistics and Regression Analyses (with associated error treatment) which can be performed on almost any version of Excel. Regression - Used to determine the line of best fit (for a set of x and data), including evaluating the associated 95% Confidence Limits for the fitted parameters.Ī simplistic solution is to find a computer running a version of Excel that does have the Analysis ToolPak installed.Descriptive Statistics - Used to determine the Mean and 95% Confidence Level for a set of readings.Having a version/copy of Excel that is missing the Analysis ToolPak is potentially problematic in that it contains two Data Analysis Tools that will commonly be used for the analysis of data from practicals performed in the Level 4 Lab. You are using a version of Excel which does support the Analysis ToolPak however this option was not selected during the original installation - This can be fixed by updating the installation, although this process often requires you to have the original Office installation disk.
#DATA ANALYSIS PACK EXCEL 2013 FOR MAC#
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