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?
-What can we conclude about this study, based on the standardized statistic in 29? (If you didn't report a standardized statistic in 29, then use for this question.)

A) We have very strong evidence that Apple's share of the US smartphone market has remained the same since 2010.
B) We have very strong evidence that Apple's share of the US smartphone market has increased since 2010.
C) We do not have very strong evidence that Apple's share of the US smartphone market has increased since 2010.
D) We have very strong evidence that the proportion of the representative sample of 529 smartphone users in the US using an Apple iOS device is greater than 0.30.