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An investigator wants to find the average daily temperature of his town for June. He decides to copy the readings from the Meteorological Department's website rather than measure them himself.
Which correctly describes his data and a key limitation?

Class 9Collection and Presentation of DataStatistics and Probability
  • ASecondary data; he must check that the source is reliable
  • BPrimary data; it is always perfectly accurate
  • CPrimary data; no checks are needed
  • DRaw data that cannot be tabulated

Step-by-Step Solution

Data taken from a source already published by someone else is secondary; its main caution is verifying the source's reliability.
Answer: A) Secondary data; he must check that the source is reliable

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