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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...

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

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