Bleach is a water-based solution commonly used as a disinfectant. It can be purchased in various concentration of the active sodium hypochlorite (NaCIO) ingredient. Sodium hypochlorite denatures proteins in microorganisms and is effective in killing bacteria, fungi, and viruses. Assume that available NaCIO concentrations (mg/ml) are 2.67, 4.62, 4.14, 3.81, 3.83. Suppose the desired concentration value is 4 mg/ml. Does the (small) sample data suggest that true average concentration is less than the desired value? The t-score is -0.579 A/ (to three decimal places). The p-value is 0.2968 A (to four decimal places). Thus, we can not reject A/ (reject OR not reject) the null hypothesis at the 0.05 significance level that true average concentration of NaCIO is at least 4 mg/ml