Problem-Solving and Data Analysis
Use a random sample to estimate a whole population, read a margin of error as a range of likely values, and compare samples of different sizes.
A sample only speaks for the group it was drawn from. And a larger random sample gives a smaller margin of error, not a larger one.
Full skill name: Inference from sample statistics and margin of error
Pick an answer to check it and see why. Practice sets also have grid-ins, where you type the answer.
Easy
A park ranger selected 40 of the 600 campsites in a state park at random and inspected them. Of the campsites inspected, 6 had a damaged fire ring. Based on this sample, which of the following is the best estimate of the number of campsites in the park that have a damaged fire ring?
Medium
A quality inspector randomly samples 400 light bulbs from a large shipment and finds 12 defective. About how many defective bulbs would be expected in a shipment of 10,000 bulbs?
Hard
A random sample of 400 voters produces an estimated percentage with a margin of error of 5 percentage points. Using the same method, a random sample of 1,600 voters would be expected to have a margin of error closest to which value?
Start a set in this skill. Every answer comes with an explanation.
42 questions in the bank: 6 Easy, 21 Medium, 15 Hard.