Critical Value Worksheet with Answer Key

What's on the worksheet

1. For each confidence level, give the area in each tail, the area to the left of z^*, and the critical value z^*.
   C = 85\%C = 94\%C = 97\%C = 99.9\%C = 65\%
2. Each interval below was built as p ± z^*\,SE with the multiplier shown.
   z^* = 1.50z^* = 2.00z^* = 1.75z^* = 0.80z^* = 3.00
3. Here are some rows of the standard normal table, $\Phi
4. A large company has about 30,000 employee accounts.
5. A state biologist catches a random sample of 320 frogs in a large wetland and swabs each for a skin fungus; 72 carry it (made-up data).
6. Each statement below about critical values is wrong.