Bias and Variability of an Estimator Worksheet with Answer Key

What's on the worksheet

1. A city has 4,000 fire hydrants, and 0.30 of them need repainting (a made-up value, known for the simulation).
2. The 2,000-meter times of a large rowing club's members have variance ² = 165 square seconds.
3. The four horses at a riding stable are 4, 10, 12 and 16 years old, so the range of their ages is 12 years.
4. A stamp printer misprints each stamp with chance p = 0.12, independently of the others (a made-up chance).
5. A martial arts school has four classes, with 6, 6, 12 and 24 students, and each of its 48 students is in exactly one class.
6. Say whether each statement is true or false, and explain.