Is Tom's data or the internet data more reliable? Give a reason for your answer.

Reliability refers to the trustworthiness of data. Tom collected his own data (primary data), so he knows the sampling method, the exact questions asked, and the population it came from. The internet data is secondary data, and the question specifically states it "has no source". Without a source, we cannot know who collected it, when it was collected, what the sample size was, or what the exact methodology was. Therefore, we cannot verify its accuracy or check for bias. Data from a known, transparent process is always more reliable than data from an unknown, anonymous source.