Sample Problems

Here is a practice SE problem (margin of error):

Nielsen is interested in seeing if the Northeast has different viewing patterns than the rest of the country, so they systematically choose a random sample of 800 homes and measure the TV ratings. They note that the rating for Sunday Night Football is 25. What is the SE?

Here is a sample SD problem:

An executive at ABC wants to know which sitcom to air this fall. Her choices are between two shows-- "Welcome home, son!" or "Married with Children... Again."  

The first show was tested across the country and returned acceptance scores of 5,5,5,4,1 (on a scale of 1-5), and the second show returned scores of 5,4,4,4,3. 

Which show should she choose and why?

Here is a sample z-Score problem:

Which show had the better year relative to expectations, The Bachelor or The Bachelorette? How do you know?

Average rating of The Bachelor: 6.1

SD: 4

This year's rating of The Bachelor: 7.1

Average rating of The Bachelorette: 4.5

SD: 2

This year's rating of The Bachelorette: 5.3