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review the amount of customer’s spending before and after the promotion. The table below shows the spending of a sample of 12 customers in October (before the promotion) and in November (after the promotion): Customer 1 2 3 4 5 6 7 8 9 10 11 12 Spending in October 3500 4200 2675 2420 3450 2990 3430 3480 3720 4455 3830 3980 Spending in November 3920 4505 3147 2940 3786 3210 3620 3747 3810 4480 3970 4000 (a) Construct a 95% confidence interval estimate for the population mean spending in October. (b) Use D to denote the amount of money a customer spends more in November than in October. Construct a 90% confidence interval estimate for the population mean of D
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