2. In 18 patients with Everley's syndrome, the mean level of plasma phosphate was 1.7 mmol/l (millimoles per liter) with a standard deviation of 0.8 mmol/l. If the mean level in the general population is 1.2 mmol/l, is there a statistically significant difference between the general population mean and these 18 patients' mean? Make sure to go through all the steps for hypothesis testing: state the appropriate test to use, state the hypotheses, and then do the calculations and providing a brief explanation of your results. Conduct a two-sided test and show your calculations for partial credit if applicable.