Final answer:
A comparative plot showing the percentage of cell phone ownership between Los Angeles residents and other Californians such as a bar graph or pie chart would be the most effective in answering the question.
Step-by-step explanation:
To answer the question "Are LA people more likely to own a cell phone than other Californians?" a plot comparing the proportion of cell phone ownership among Los Angeles residents to the proportion among residents in other parts of California would be most useful. This could be a bar graph or a pie chart that clearly shows the percentage of cell phone owners in each region.
For more detailed insights, a segmented bar graph could further break down the ownership data by factors such as age, income level, or ethnicity if that information is available. This would enable one to see not only the overall cell phone ownership rates but also how they might vary within subgroups.
If the data is related to specific types of phones or the impact of smartphones on daily life, those factors should be considered as well. Additionally, it would be essential to ensure the data collected is representative of the population, avoiding selection bias, to draw accurate conclusions about the differences in ownership between regions. Statistical tests could be used to determine if there is a significant difference between the proportions, such as a hypothesis test for two proportions.