The line graph presented illustrates the average monthly cost of contract mobile phones in a European country from January to September 2002, denominated in euros.
Overall, the data reveal distinct trends among the four models, with Domo and Lex experiencing an upward trajectory, Sim TX observing a decline, and Alpha undergoing a significant increase towards the latter part of the period.
In detail, Domo commenced its trajectory at approximately 10 euros, reaching a peak of about 25 euros by September. This upward trend underscores a steady increase in its pricing throughout the observed months. Similarly, Lex initiated at 5 euros and exhibited gradual growth, culminating in a high of 15 euros in July before settling at 12 euros in September. This pattern suggests a moderate rise, albeit with less pronounced fluctuation than Domo.
Conversely, Sim TX began the year at 20 euros but experienced a marked decline, plummeting to 10 euros in July before experiencing a slight recovery, ultimately reaching 15 euros by September. This fluctuation indicates a period of instability. Lastly, Alpha remained relatively stable at 5 euros until June, at which point it surged dramatically, ultimately peaking at 10 euros in September. This remarkable increase positions Alpha as the most dynamic option among the four models by the end of the observation period.