7. A rendom sample of Joo cushomera, who viaited a deportment store,spnt an average of #77 at this store . Assume Hhat 6=#19. The 97% confidence interval for the population mean is! a) 74.56 to 79.44 b) 70.18 to 83-82 as c) 73.89 to 80-1) d) 72.88 to 81-12

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