Alpha Product Services (APS) is an electronic device developer. The management wants to develop a new smartphone. It needs to decide on the warranty period that will correspond to the phone's lifespan. It has contracted you to perform a Statistical analysis on this issue.

You decide to implement a multiple regression analysis by collecting data from a sample of people on the lifespans of their previous smartphones and the possible factors.

1. Explain individually your choice of three independent quantitative variables and one qualitative dummy variable in the data collection. The variables shall be a mix of user and product attributes.
2. State one statistical issue which may arise from the data collection and explain how you would prevent or minimizethe occurrence of this issue.

Note:

1. You are not required to collect the actual data and carry out the analysis.
2. You shall focus your original and reply posts on applying Statistics theories, practices and concerns to address the issues, rather on discussing solely on the products.