The desired percentage of silicon oxide (SiO2), in a certain type of cement is 5.5. To test if the actual average percentage is 5.5 for a given production facility, 16 samples obtained independently are analyzed. Suppose that the percentage of SiO2 in a sample has a normal distribution with sigma σ = 0.3 and that bar {x} = 5.25. What is the conclusion at a significance level of 0.05?