refactor: improve type specificity

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---

Author: kgryte

lib/node_modules/@stdlib/stats/base/ztest/one-sample/results/factory/docs/types/index.d.ts

@@ -18,6 +18,11 @@
 
 // TypeScript Version: 4.1
 
+/**
+* Alternative hypothesis.
+*/
+type Alternative = 'two-sided' | 'greater' | 'less';
+
 /**
 * Interface describing test results.
 */
@@ -30,7 +35,7 @@ interface Results<T> {
 	/**
 	* Alternative hypothesis.
 	*/
-	alternative?: string;
+	alternative?: Alternative;
 
 	/**
 	* Significance level.
@@ -85,7 +90,7 @@ declare class ResultsStruct<T> {
 	/**
 	* Alternative hypothesis.
 	*/
-	alternative: string;
+	alternative: Alternative;
 
 	/**
 	* Significance level.

lib/node_modules/@stdlib/stats/base/ztest/one-sample/results/struct-factory/docs/types/index.d.ts

@@ -30,7 +30,7 @@ interface Results<T> {
 	/**
 	* Alternative hypothesis.
 	*/
-	alternative?: string;
+	alternative?: number;
 
 	/**
 	* Significance level.
@@ -85,7 +85,7 @@ declare class Struct<T> {
 	/**
 	* Alternative hypothesis.
 	*/
-	alternative: string;
+	alternative: number;
 
 	/**
 	* Significance level.
@@ -116,11 +116,6 @@ declare class Struct<T> {
 	* Standard error of the mean.
 	*/
 	sd: number;
-
-	/**
-	* Test method.
-	*/
-	method: string;
 }
 
 /**