Question 8.80

8.80 Effect of the Fox News app

A survey that sampled smartphone users quarterly compared the proportions of smartphone users who visited the Fox News website before and after the introduction of a Fox News app. A report of the survey stated that 17.6% of smartphone users visited the Fox News website before the introduction of the app versus 18.5% of users after the app was introduced.20 Assume that the sample sizes were 5600 for each condition.

  1. What is the explanatory variable for this study?
  2. What is the response variable for this study?
  3. Give a 95% confidence interval for the difference in the proportions.