Define random errors.

Define gross errors. Give example.

Assertion : Systematic errors and random errors fall in the same group of errors. Reason : Both systematic and random errors are based on the cause of error.

Statement-I: Random errors can be positive or negative. Statement-II: Cause of random errors are uncertain.

We can reduce random errors by

The best method to reduce random error is

if the randon error in the arithmetic mean of 50 observations is alpha , then the random error in the arithmetic mean of 150 observations would be

The random error in the arithmetic mean of 100 observations is x, then random error in the arithmetic mean of 400 observations would be

When 10 observations are taken, the random error is x , When 100 oberservations are taken, the random error becomes