<prompt> In a population of pregnant female, Hb is estimated on 100 women with standard detion of 1gm . The standard error is:10.10.0110  <response>: The most common parameters of interest in health are mean m and propoion p. They tend to vary from sample to sample, if we take repeated samples from a target population the sample means and propoion will have a gaussian or non-gaussian distribution, called sampling distribution. The sample means will tend to vary around a population standard detion, but this variability is now called standard error of mean SEM. Similarly we can get a standard error of propoion. The larger the standard error, larger will be the variability and less is our confidence in the sample results. SE mean Sample standard detion where n sample size ?n SE propoion ?p1-p where p propoion, and n sample size ?n In this question, we can apply the given information to the formula for calculation of Standard error of mean as: 110 0.1Square root of 100 is 10 Ref: Parks Textbook of Preventive and Social Medicine; 18th edition; Page-649 