Point Estimates and the Margin of Error Worksheet with Answer Key

What's on the worksheet

1. Each line describes a random sample from a large population.
   n = 400,\ x = 132n = 150,\ x = 36n = 2{,}500,\ x = 1{,}850n = 81,\ \bar{x} = 42.5,\ s_x = 13.5
2. A state utilities board surveys a random sample of 800 households (made-up data) and finds that 176 of them still have a landline telephone.
3. A state poll reports that between 41% and 47% of the state's adults want to stay on standard time all year.
4. A city's recycling office weighs one week of food waste from a random sample of 100 households (made-up data).
5. A state wildlife agency polls a random sample of 625 licensed hunters each year and reports one margin of error, plus or minus 4 percentage points,…
6. A school district asks families whether they favor a four-day school week (made-up data).