According to comScore, Apple’s smartphone operating system controlled 39% of the U. S. smartphone market in February 2013. Suppose Apple believes that this market share will increase due to recent advertising campaign. To test this hypothesis, a random sample of 275 smartphone users was selected, 126 of whom owned smartphones using Apple’s operating system. Using σ = 0.05, answer the following.
a. State the null and alternative hypothesis.
b. Based on this sample, what conclusions can be drawn for this test?
c. Determine the p value for this test and interpret its meaning.
d. Verify your results using PHStat.