Which control chart uses sample standard deviation instead of range?

The control chart that utilizes the sample standard deviation instead of the range is the X-s chart. This type of chart is particularly useful for monitoring the process mean and variation in a continuous data context where the sample standard deviation is a more informative statistic than the range, especially when the data is normally distributed. By incorporating the standard deviation, the X-s chart provides a more reliable indication of process variability and tends to be more sensitive than other charts that rely on the range.

In comparison, the X-R chart uses the range, which can be influenced heavily by extreme values and might not accurately represent the typical variation within a data set. The XmR chart, which stands for Individual and Moving Range chart, focuses on individual measurements and is not based on standard deviation. The Pp chart, on the other hand, is a process capability chart assessing how well a process meets specifications, rather than monitoring process control through standard deviations or ranges.

Hence, for monitoring and controlling process standard deviation in a robust manner, the X-s chart is the preferred choice, making it the correct answer for this question.