fix: use correct alternative hypothesis

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/ztest/two-sample/results/to-string/README.md

@@ -81,7 +81,7 @@ The function supports the following options:
 
     Two-sample Z-test
 
-    Alternative hypothesis: True mean is less than 1.0
+    Alternative hypothesis: True difference in means is less than 1.0
 
         pValue: 0.0406
         statistic: 9.9901

lib/node_modules/@stdlib/stats/base/ztest/two-sample/results/to-string/docs/types/index.d.ts

@@ -99,7 +99,7 @@ interface Options {
 *
 *     Two-sample Z-test
 *
-*     Alternative hypothesis: True mean is less than 1.0
+*     Alternative hypothesis: True difference in means is less than 1.0
 *
 *        pValue: 0.0406
 *        statistic: 9.9901

lib/node_modules/@stdlib/stats/base/ztest/two-sample/results/to-string/lib/main.js

@@ -40,7 +40,7 @@ var format = require( '@stdlib/string/format' );
 *
 *     Two-sample Z-test
 *
-*     Alternative hypothesis: True mean is less than 1.0
+*     Alternative hypothesis: True differences in means is less than 1.0
 *
 *        pValue: 0.0406
 *        statistic: 9.9901
@@ -124,7 +124,7 @@ function toString( results, opts ) { // eslint-disable-line stdlib/no-redeclare
 		'',
 		results.method,
 		'',
-		format( 'Alternative hypothesis: True mean is %s %0.'+dgts+'f', alt, results.nullValue ),
+		format( 'Alternative hypothesis: True difference in means is %s %0.'+dgts+'f', alt, results.nullValue ),
 		'',
 		format( '    pValue: %0.'+dgts+'f', results.pValue ),
 		format( '    statistic: %0.'+dgts+'f', results.statistic ),

lib/node_modules/@stdlib/stats/base/ztest/two-sample/results/to-string/test/test.js

@@ -99,7 +99,7 @@ tape( 'the function throws an error if provided a `digits` option which is not a
 	}
 });
 
-tape( 'the function throws an error if provided a `digits` option which is not a boolean', function test( t ) {
+tape( 'the function throws an error if provided a `decision` option which is not a boolean', function test( t ) {
 	var results;
 	var values;
 	var i;
@@ -153,7 +153,7 @@ tape( 'the function serializes a results object to a string (rejected)', functio
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is not equal to 0.0000',
+		'Alternative hypothesis: True difference in means is not equal to 0.0000',
 		'',
 		'    pValue: 0.0132',
 		'    statistic: 2.4773',
@@ -190,7 +190,7 @@ tape( 'the function serializes a results object to a string (not rejected)', fun
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is not equal to 0.0000',
+		'Alternative hypothesis: True difference in means is not equal to 0.0000',
 		'',
 		'    pValue: 0.0132',
 		'    statistic: 2.4773',
@@ -227,7 +227,7 @@ tape( 'the function serializes a results object to a string (two-sided)', functi
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is not equal to 0.0000',
+		'Alternative hypothesis: True difference in means is not equal to 0.0000',
 		'',
 		'    pValue: 0.0132',
 		'    statistic: 2.4773',
@@ -264,7 +264,7 @@ tape( 'the function serializes a results object to a string (less)', function te
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is less than 0.0000',
+		'Alternative hypothesis: True difference in means is less than 0.0000',
 		'',
 		'    pValue: 0.0132',
 		'    statistic: 2.4773',
@@ -301,7 +301,7 @@ tape( 'the function serializes a results object to a string (greater)', function
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is greater than 0.0000',
+		'Alternative hypothesis: True difference in means is greater than 0.0000',
 		'',
 		'    pValue: 0.0132',
 		'    statistic: 2.4773',
@@ -340,7 +340,7 @@ tape( 'the function supports displaying the test decision (decision=true)', func
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is not equal to 0.0000',
+		'Alternative hypothesis: True difference in means is not equal to 0.0000',
 		'',
 		'    pValue: 0.0132',
 		'    statistic: 2.4773',
@@ -379,7 +379,7 @@ tape( 'the function supports not displaying the test decision (decision=false)',
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is less than 0.0000',
+		'Alternative hypothesis: True difference in means is less than 0.0000',
 		'',
 		'    pValue: 0.0132',
 		'    statistic: 2.4773',
@@ -416,7 +416,7 @@ tape( 'the function supports specifying the number of displayed digits (digits=2
 		'',
 		'Two-sample Z-test',
 		'',
-		'Alternative hypothesis: True mean is not equal to 0.00',
+		'Alternative hypothesis: True difference in means is not equal to 0.00',
 		'',
 		'    pValue: 0.01',
 		'    statistic: 2.48',