Which of the following studies will yield the best estimate of the population mean from a single sample?
A. A study with 60 people with various backgrounds answering about their opinion on recent immigration policy.
B. A study with 15,000 people with similar political views about their opinion on current U.S. President.
C. A study that assessed reading skills of 40 fourth-grade children in an accelerated program.
D. A study which measured height of 15,000 students from a coed college.
Answer: B
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