Enums for statistics

src/eva2/server/stat/StatsOnSingleDataSetEnum.java

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+package eva2.server.stat;
+
+public enum StatsOnSingleDataSetEnum {
+	mean, median, variance, stdDev;
+	
+	public static String[] getInfoStrings(){
+		return new String[] {"The mean value", "The median value", "The variance", "The standard deviation"}; 
+	}
+}

src/eva2/server/stat/StatsOnTwoSampledDataEnum.java

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+package eva2.server.stat;
+
+public enum StatsOnTwoSampledDataEnum {
+	tTestEqLenEqVar, tTestUneqLenEqVar, tTestUneqLenUneqVar, mannWhitney;
+	
+	public static String[] getInfoStrings(){
+		return new String[] {"Two-sampled t-Test with equal sized data sets", 
+				"Two-sampled t-Test with unequal sized data sets", 
+				"Two-sampled t-Test with unequal data sets and unequal variances", 
+				"Two-sampled Mann-Whitney test"}; 
+	}
+}