Red Rocks Park in Morrison, Colorado, is a naturally formed, rock, open‑air amphitheater located 6450 ft above sea level. A random sample of events held at this site in summer 2018 was obtained, and the attendance for each was recorded. The summary statistics were sample mean =8722, sample standard deviation =460.4, and sample size =11. Assume the distribution of attendance is normal and use the significance level =0.01. The population mean = 9000

a) Determine the value of the test statistic .statistic t.(Use decimal notation. Give your answer to four decimal places.)