1532-float-abest 125 9 of 18 Q7(8). It was reported the average time that customers spend in one furniture store is 55 mins. Store manager believes customers spend longer in the store during promotion. A random sample of 9 customers was selected, their time spent in store during promotion was recorded. The sample mean time is 65 mins. Assume the time spent in store is normal with standard deviation 0 = 15 mins. Use the P-value method to test if the mean time spent in store increases during promotion. Let significance level be 0.01