Question

what precaution should be used by using secondary data.

Answer 1

1. Suitable Purpose of Investigation

2.  Inadequate Data

3. Definition of Units

4. Degree of Accuracy

5.  Time and Condition of Collection of Facts

6. Comparison

7. Test Checking

8.  Homogeneous Conditions

I'm sure you can look into those more closely if need be. Hope this helped.

Answer 2

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