Which of the Following Statistical Distributions Is Used When Estimating

Short Answer

Which of the following statistical distributions is used when estimating the population mean when the population variance is unknown? $\begin{array}{|l|l|}\hline A&\text {Student \( t \) distribution }\\\hline B&\text { Standard normal distribution}\\\hline C&\text { Chi-square distribution}\\\hline D&\text {None of these choices are correct. }\\\hline \end{array}$