In a group of 100 children, the weight of a child is 15 kg. The standard error is 1.5 kg. Which one of the following is TRUE -: (A) 95% of all children weigh between 12 and 18 kg, (B) 95% of all children weigh between 13.5 and 16.5 kg, (C) 99% of all children weigh between 12 and 18 kg, (D) 99% of all children weigh between 13.5 and 16.5kg
Answer is A. Here the examiner himself has given us the value of standard error = 1.5
So, we can directly apply sample data to the population.
95% of data will be covered by 2 standard error = 15 ± 2 SE = 12 ± 3 = 12 to 18