In order to determine whether or not there is a significant difference between the mean hourly wages paid by two companies (of the same industry), the following data have been accumulated. Company A Company B Sample size 90 45 Sample mean $17.75 $17.25 Sample standard deviation $1.00 $0.95 The p-value is 0.0057. At the 5% level of significance, the null hypothesis should not be rejected. should be rejected. should not be tested. should be revised.