The First IPhone Became Available for Public Purchase in 2007

Multiple Choice

The first iPhone became available for public purchase in 2007. By 2010, approximately 30% of smartphone users in the US owned an iPhone. Several new companies have entered the smartphone market since then and the folks at Apple want to know how they are stacking up against their competition. In 2019, a representative sample of 529 smartphone users in the US showed that 47.4% use an Apple iOS device. Does it appear that Apple's share of the US smartphone market has increased since 2010?
-Let X represent the value of your standardized statistic in 29. Select the best contextual interpretation of the value X.

A) On average, each simulated proportion of the US smartphone market which uses Apple iOS devices is X away from 0.299.
B) The probability of obtaining a sample proportion of 0.474 or something more extreme, assuming 30% of all US smartphone users use an Apple iOS device, is X.
C) The proportion of the US smartphone market that uses an Apple iOS device is X.
D) The 0.474 proportion of the US smartphone users sampled who use Apple iOS devices is X standard deviations above the 2010 Apple US market-share of 0.30.