solution

Twitter opinions of iPhone 6 features. Refer to the Decision Analytics (October 2015) study of the features of Apple’s iPhone 6, Exercise 2.13 (p. 74). Recall that opinions were extracted from a sample of 552 tweets obtained from the social media site Twitter.com. The tweets originated in four cities: San Francisco (138 tweets), New York (182), Los Angeles (89), and Chicago (143). A summary of the opinions on the iPhone 6 camera (Excellent, Good, or Bad) from tweets in each city is reproduced below. Conduct a test to compare the opinions on the iPhone 6 camera for tweets originating in the four cities. Is there evidence to conclude that the distribution of excellent, good, and bad opinions differs depending on the city? Use  = .05.

Exercise 2.13

Twitter opinions of iPhone 6 features. What are the features of Apple’s iPhone 6 that appeal most to customers? To answer this question, researchers collected data on customer opinions and published the results in Decision Analytics (October 2015). The opinions were extracted from a sample of 552 tweets obtained from the social media site Twitter.com. (Any tweet that referred to “iPhone 6” was eligible for selection.) The tweets originated in four cities: San Francisco (138 tweets), New York (182), Los Angeles (89), and Chicago (143). The table below summarizes the opinions on the iPhone 6 camera (excellent, good, or bad) from tweets in each city.

a. Create a pie chart to show the proportion of tweets in the sample that originate in the four cities.

b. Create a pie chart to summarize the opinions on the iPhone 6 camera from tweets that originate in San Francisco.

c. Construct side-by-side bar charts to compare the opinions on the iPhone 6 camera for tweets originating in the four cities.

d. Refer to part c. What inferences can you make about customer satisfaction with the iPhone 6 camera?