Apreliminary study of hourly wages paid to unskilled employees in three metropolitan areas was conducted. seven employees were included from area a, 9 from area b, and 12 from area c. the test statistic was computed to be 4.91. what can we conclude at the 0.05 level? a. mean hourly wages in at least 2 metropolitan areas are differentb. more degrees of freedom are neededc. mean hourly wages of unskilled employees of all areas are equald. none of these is correct