docs: improve README examples for stats/base/dists/t namespace

PR-URL: stdlib-js#1728
Closes: stdlib-js#1645 

Reviewed-by: Athan Reines <kgryte@gmail.com>
Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>

lib/node_modules/@stdlib/stats/base/dists/t/README.md

@@ -108,10 +108,23 @@ var y = dist.cdf( 0.5 );
 <!-- eslint no-undef: "error" -->
 
 ```javascript
-var objectKeys = require( '@stdlib/utils/keys' );
 var t = require( '@stdlib/stats/base/dists/t' );
 
-console.log( objectKeys( t ) );
+var dof = 3;
+var x = 1.5;
+
+// Evaluate the probability density function (PDF) at a specific value:
+var res = t.pdf( x, dof );
+console.log( 'PDF at x = ' + x + ': ' + res );
+
+// Evaluate the cumulative distribution function (CDF) at a specific value:
+res = t.cdf( x, dof );
+console.log( 'CDF at x = ' + x + ': ' + res );
+
+// Get the mean and variance of the t distribution:
+var mu = t.mean( dof );
+var v = t.variance( dof );
+console.log( 'Mean: ' + mu + ', Variance: ' + v );
 ```
 
 </section>

lib/node_modules/@stdlib/stats/base/dists/t/examples/index.js

@@ -18,7 +18,20 @@
 
 'use strict';
 
-var objectKeys = require( '@stdlib/utils/keys' );
 var t = require( './../lib' );
 
-console.log( objectKeys( t ) );
+var dof = 3;
+var x = 1.5;
+
+// Evaluate the probability density function (PDF) at a specific value:
+var res = t.pdf( x, dof );
+console.log( 'PDF at x = ' + x + ': ' + res );
+
+// Evaluate the cumulative distribution function (CDF) at a specific value:
+res = t.cdf( x, dof );
+console.log( 'CDF at x = ' + x + ': ' + res );
+
+// Get the mean and variance of the t distribution:
+var mu = t.mean( dof );
+var v = t.variance( dof );
+console.log( 'Mean: ' + mu + ', Variance: ' + v );