Why does the standard deviation always get smaller as the sample size increases? Group of answer choices a)Both SD and SE measure the variability within a sample, but SD decreases as sample size increases due to the reduction in sampling error. b)SD measures the spread of individual data points around the mean, while SE represents the precision of the sample mean estimate. c)SD estimates the population variability, whereas SE quantifies the uncertainty in the sample mean. d)SD provides information about the dispersion within a sample, while SE indicates the accuracy of the sample mean as an estimate of the population mean