Answer to Question 1
T
Time between observations increases the possibility of both history effect and maturation effect.
Answer to Question 2
There are several reasons for taking a sample rather than a complete census. One is for pragmatic reasons - applied marketing research projects usually have budget and time constraints. In most situations, sampling cuts costs, reduces labor requirements, and gathers vital information quickly. Another major reason for sampling is that most properly selected samples give results that are reasonably accurate. Larger samples allow conclusions to be drawn with more confidence that they truly represent the population. Sometimes, a sample may even be more accurate than a census due to fewer interviewer mistakes, tabulation errors, and other nonsampling errors. A third reason to take a sample rather than a census is the fact that many research projects require the destruction of the items being tested.
Mendel's Monohybrid Experiments p1
Applying a time strip to the IV container.
Men and women work the same number of hours a week, but men spend more time on paid work, and women ...
Velocity-time Graph
Disitive Time For Vegetables
Time spent on, paid work and housework, by living arrangements of Canadian