Question 8.20

8.20 Smartphones and purchases

A Google research study asked 5013 smartphone users about how they used their phones. In response to a question about purchases, 2657 reported that they purchased an item after using their smartphone to search for information about the item.6

  1. What is the sample size for this survey?
  2. In this setting, describe the population proportion in a short sentence.
  3. What is the count ? Describe the count in a short sentence.
  4. Find the sample proportion .
  5. Find , the standard error of .
  6. Give the 95% confidence interval for in the form of estimate plus or minus the margin of error.
  7. Give the confidence interval as an interval of percents.