Final answer:
Apple Inc.'s delay of the iPhone X release changed the 'product' variable, leading to necessary adjustments in the 'promotion' variable within the marketing mix, particularly the scheduling of TV advertisements.
Step-by-step explanation:
When Apple Inc. delayed the launch of its new iPhone X, it needed to reschedule its TV advertisement announcing the new product. In this case, a change in the product variable caused changes in the promotion variable of the marketing mix. The marketing mix consists of four key variables often referred to as the 4 P's: Product, Price, Place, and Promotion. In this instance, the delay of the iPhone X release is a change in the Product variable, which then necessitates an alteration in the Promotion strategy, specifically the timing of the TV advertisements.
The change in the product launch schedule directly affects the company's promotional activities. The TV advertisement, an element of the Promotion variable, needs to be rescheduled to align with the new launch date. This is a practical example of how different components of the marketing mix are interdependent.