City hall wishes to learn about the rate of parking meter use. They choose eight downtown blocks at random (these are city blocks, not statistical blocks!), and on each block they choose five meters at random. Six weeks are chosen randomly from the year, and the usage (money collected) on each meter is measured every day (Monday through Sunday) for all the meters on those weeks. 1What are the sources of variability in the data? (Hasse diagram may help.) 2. Which factors are fixed and which factors are random? 3. Are factors crossed/nested with each others? 4. Write down the corresponding model? 5. Hypotheses of interests?