A random sample of 100 customers, who visited a department store, spent an average of $77 at this store with a sample standard deviation of $19. The 98% confidence interval for the population mean is:

Answer

32.73 and 121.27

76.56 and 77.44

73.28 and 80.72

72.57 and 81.43

Answer

32.73 and 121.27

76.56 and 77.44

73.28 and 80.72

72.57 and 81.43