Answer:
C) Stratified sampling
Explanation:
Stratified sampling: This is one of the probability sampling technique in which the researcher tends to divides a particular population that is taken for the researcher purpose into various groups or strata, and after dividing the population, the researcher randomly finally selects the participants from those groups or strata and being analyzed later on. Further, the group is taken for study is through the random sampling technique.
Advantage:
1. It provides great precision.
2. The study group is small, hence cost-effective.
Answer:
4) downward mobility
Explanation:
Social mobility is the movement of the citizens, individuals, families, or the groups through the system of the social stratification or hierarchy.
If the movement involves the loss in the social class and the economy, it is known as downward mobility.
Thus, in the given case study in which the people after the recession, lost their jobs, house and many other circumstance, shows that it was a time of downward mobility for these people.
Observation skills, you could make inferences and predictions
Answer:
It will take 12 hours to fill the tank
Step-by-step explanation:
Proportions
Tap A fills a tank in 4 hours. It means each hour it fills 1/4 of the tank.
Tap B fills the tank in 3 hours. Each hour it fills 1/3 of the tank.
Tap C empties the tank when full in 2 hours. Each hour it empties 1/2 of the tank.
Each hour, the tank gets filled by:
Since the tank fills 1/12 of its capacity in one hour, it follows that it will take 12 hours to fill the tank
