Problem:
The average reflected light value found for 25 red marbles is found to be 25.7. It is known the standard deviation for the marble population is 2.9.
Find the 99% confidence interval for available marbles.
Question to answer:
What is the MATLAB command (full and correct syntax) to find the z value needed to solve the problem above (that is zalpha/2 used in the CI formula)?
Do not use spaces in your answer. Do not use unnecessary parentheses in your answer.