A lawyer claims that the average years of settling criminal cases filed before courts is three and a half years. To test the claim, a watchdog organization randomly selected 35 criminal cases and recorded the years the cases took before the courts have rendered verdicts. The sample mean was 4 years with a standard deviation of three and a half years. Do the data gathered by the said organization provide sufficient basis to accept the claim of the lawyer? Use 0.05 level of significance.