The First IPhone Became Available for Public Purchase in 2007

Short Answer

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?
-The following simulated null distribution of proportion of "Apple iOS users" that could happen by chance alone in a sample of 529 smartphone users was created with the One Proportion applet. Also, given are the mean and SD for this null distribution.
Calculate and report the standardized statistic.