Question

The random error in the arithmetic mean of 50 observations is ‘a’ , then the random error in the arithmetic mean of 200 observations a would be

(a) 4\(a\)

(b) 16\(a\)²

(c)\(\frac{a}{4}\)

(d) \(\frac{a}{2}\)

Answer 1

Correct answer is (c)\(\frac{a}{4}\)