Launching a new packaged snack is never a sure thing. In fact, new foods fail within 18 months about 85% of the time, according to Charisse Hughes, chief growth officer of Chicago-based Kellanova, whose brands include Cheez-It, Pop-Tarts and Pringles. That’s why when Kellanova introduced a new chip variety last year, Pringles Mingles, the brand did so within a new data framework that helped guide everything from product design to flavor profiles to advertising.