Confidence Intervals for Population Mean: Videos & Practice Problems

A researcher is studying the heights of a rare plant species. The population standard deviation of plant heights is known to be $3.12\text{ cm}$. A random sample of $12$ plants has a mean height of $24.85\text{ cm}$. Heights are normally distributed. Construct a $95\%$ confidence interval (in $\text{cm}$) for the population mean height.