Question

scientists usually experiment by collecting data
select one:
○ a. from one source only.
○ b. from their relatives.
○ c. only from other researchers and comparing their results.
○ d. from as large a sample as possible.

Explanation:

To ensure the validity and reliability of experimental results, scientists need representative data. Collecting data from a large sample (option d) helps reduce bias and increase the generalizability of findings. Options a (one source) is limited, b (relatives) introduces bias, and c (only other researchers) is too restrictive.

Answer:

d. from as large a sample as possible.