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<h1>TTEST Function</h1>
<p>The <b>TTEST</b> function is one of the statistical functions. It is used to return the probability associated with a Student's t-Test. Use <b>TTEST</b> to determine whether two samples are likely to have come from the same two underlying populations that have the same mean.</p>
<p>The <b>TTEST</b> function syntax is:</p>
<p style="text-indent: 150px;"><b><em>TTEST(array1, array2, tails, type)</em></b></p>
<p><em>where</em></p>
<p style="text-indent: 50px;"><b><em>array1</em></b> is the first range of numeric values.</p>
<p style="text-indent: 50px;"><b><em>array2</em></b> is the second range of numeric values.</p>
<p style="text-indent: 50px;"><b><em>tails</em></b> is the number of distribution tails. If it is 1, the function uses the one-tailed distribution. If it is 2, the function uses the two-tailed distribution.</p>
<p style="text-indent: 50px;"><b><em>type</em></b> is a numeric value that specifies the kind of t-Test to be performed. The value can be one of the following:</p>
<table style="width: 40%">
<tr>
<td><b>Numeric value</b></td>
<td><b>The kind of t-Test</b></td>
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<tr>
<td>1</td>
<td>Paired</td>
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<td>2</td>
<td>Two-sample equal variance (homoscedastic)</td>
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<td>3</td>
<td>Two-sample unequal variance (heteroscedastic)</td>
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</table>
<p>The values can be entered manually or included into the cell you make reference to.</p>
<p>To apply the <b>TTEST</b> function,</p>
<ol>
<li>select the cell where you wish to display the result,</li>
<li>click the <b>Insert function</b> <img alt="Insert function icon" src="../images/insertfunction.png" /> icon situated at the top toolbar,
<br />or right-click within a selected cell and select the <b>Insert Function</b> option from the menu,
<br />or click the <img alt="Function icon" src="../images/function.png" /> icon situated at the formula bar,
</li>
<li>select the <b>Statistical</b> function group from the list,</li>
<li>click the <b>TTEST</b> function,</li>
<li>enter the required arguments separating by commas or select a range of cells with the mouse,</li>
<li>press the <b>Enter</b> button.</li>
</ol>
<p>The result will be displayed in the selected cell.</p>
<p style="text-indent: 150px;"><img alt="TTEST Function" src="../images/ttest.png" /></p>
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