MATH 1040 - Introduction to Statistics
Practice
- What is the critical value for the 92% confidence level?
If the central area is 92%, then the remaining 8% is in the tails, with 4% in each tail.
- Using a Z-Table with a left tail of 4%, we get a critical value of
In this case, we don’t have an exact value from the Z-Table, so we take the closest we can get. Remembering that we have both positive and negative values, the critical value is $\mathbf{\pm}$ 1.75.
If we use Desmos, we can get a more precise result of $\mathbf{\pm}$ 1.751.
