Which one of the following statement is true?

The mean and standard detion of random sample will generally be different from the mean and standard detion of the population. * The standard error (SE) measures the variability of sample statistic in relation to the true population characteristic (how accurate the sample mean is as an estimate of the population mean.). * The SEM is generally smaller than the standard detion (SD). * The standard detion is the measure of the variability of the observations. * Standard error (SE) = * coefficient of variation = 100