Scenario 1 (2 pts): A marketing manager at Apple was trying to assess whether among Iphone owners the relative market shares of Iphone 11, Iphone Xs, Iphone X, and Iphone 8 were 15%, 25%, 20%, 40%. He collected 500 sample data of Iphone ownership. The sample data shows that the frequency count of the ownership is 60, 100, 140, and 200 for Iphone 11, Iphone Xs, Iphone X, and Iphone 8, respectively. We assume a significance level of .

Q1 (0.25 pts) What are the observed relative market shares among the four iPhone products?

Q2 (0.25 pts) How would you set up the null and alternative hypothesis to help the manager test his hypothesis?

Q3 (0.5 pts) Implement the hypothesis testing in Rstudio. Screen shot your R code and R code's output here.

Q4 (0.5 pts) Based on your result, what conclusion should Apple's marketing manager reach?

Q5 (0.5 pts) Please interpret the p-value in this context.