Refer to the Journal of Interactive Marketing (February 2016) study of tipping points in online "daily deal" transactions, Exercise 6.11 (p. 315). Recall that a "tipping point" is the number of voucher purchases that must exceed a predetermined value before the deal becomes active. After determining the tipping point of a daily deal, the researchers wanted to know the mean number of vouchers sold 30 minutes before and 30 minutes after the deal was activated. Summary statistics on number of vouchers sold for these two time periods are shown in the accompanying table.

a. Is there evidence to conclude that the true mean number of vouchers sold 30 minutes before the tipping point is less than 5? Test using α = .10.
b. Is there evidence to conclude that the true mean number of vouchers sold 30 minutes after the tipping point is greater than 10? Test using α = .10.

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Sample Size (Number of Mean Number Standard online deals) of Vouchers Deviation 2,211 2,617 Time Period 30 minutes before 30 minutes after 4.73 27.58 110.71 14.26