Image Based Question – 74896

Order of least Margin of error in the graph given below is ?

A. 3>2>l

B. 3>t>2

C. l>3>2

D. l:2:3

Correct Answer » A Explanation

Ans: A. 3>2>l

Ref Biostatistics Principles and Prsctice by B. Antonisamy and Mc graw hill publication, pg. 44-45

• Given image shows three normal distribution curve of different sample size.
• All three curves have same mean but different standard deviation.
  • As the sample size is decreasing, flatness of curve increasing and peak of curve diminishing which signifies wider confidence interval for given mean.
• Narrower the base of curve, lesser the margin of error will be.
• ln given question, curve I has least margin of error followed by curve 2 and curve 3 shows highest margin of error.
  • Hence correct answer is 3>2>1.