Suppose a researcher believes that the average flight delay in the US is 15 minutes. They construct a 95% confidence interval for the average flight delay, using a sample of 85 randomly selected flights, and find 14.98 < u < 23.93. What conclusion can the researcher state regarding the validity of their claim of 15 minutes. Round to 4 decimal places unless value is a whole number or comes out evenly to fewer places.