Identify the highest level of measurement of the following data. Write N for nominal, R if ratio, I - interval and O - ordinal. _____ 1. the list of house number on a street _____ 2. the number of pages of statistics textbook _____ 3. the job of 1500 individuals residing in a barangay _____ 4. the annual salaries of all government workers in the Philippines _____ 5. the date of birth of 50 famous physicist and engineers _____ 6. the marital status of teachers in a university

A researcher grouped the population according to gender and then selected samples from each of those groups. What sampling method did the researcher use?

Microwaved water is the result when heating water in a microwave. A student conducted a study on the effects of microwaved water to plants. In his study, he used two monggo plants. One plant is watered with microwaved water, and another plant is watered with clean water. What method of data collection did the student use in for the study?