16. Using a sample to make guesses about a larger group is called:

2. Why is it often hard to measure every item in a population?

10. A casino tracks the total money it keeps from a slot machine each day. While individual players may win or lose large amounts on single spins, the casino almost always makes money overall. Over many spins, the casino’s daily totals form a bell-shaped pattern centered around a profit. Why does this happen?

14. A poll reports that a political candidate has 40% support with a margin of error of 3% at a 95% confidence level. What does this mean?

13. A music company surveys some users and finds they download an average of 10 songs per month. Instead of reporting just 10, they report a range from 8 to 12. What is this range called?

7. A researcher adds up the total waiting time for groups of customers at a coffee shop. Even though individual waiting times vary a lot, the totals look predictable. Why?

12. A basketball player tracks how many shots he makes out of 50 attempts during practice to estimate how often he makes a basket. What is he calculating?

3. Why do different samples from the same population sometimes have different averages?

13. On a bell-shaped curve showing test scores, what does it mean if a student’s score is far to the right?

16. A blood test has a mean of 122 and a standard deviation of 18. Which result would be considered the most unusual?