Stratified random sampling is a method of sampling that involves the division of a population into smaller groups known as strata. In stratified random sampling or stratification, the strata are formed based on members' shared attributes or characteristics. Stratified random sampling is also called proportional random sampling or quota random sampling.
By contrast, simple random sampling is a sample of individuals that exist in a population; the individuals are randomly selected from the population and placed into a sample. This method of randomly selecting individuals seeks to select a sample size that is an unbiased representation of the population. However, it's not advantageous when the samples of the population vary widely.
Answer:
Estimate the surface area of a cube with side length 9.9 in.
A) 100 in²
B) 400 in²
C) 600 in²
D) 1000 in²
Step-by-step explanation:
9.9 to the nearest whole number is 10
We know the side length of the cube is 10
We work out the area of face and multiply by 6.
10 x 10 = 100
100 x 6 = 600 in²
Let the thickness (or the depth) of the shown figure = t
Total surface area =
=
= 10.6875 + 12.5
= 23.1875
∴ Volume = 23.1875 t
Area=basexheight
Area=9x4
Area=36
Answer:
I have exactly 5,621 dominoes, and, including myself, 23 people to set them all up. How many dominoes will each person set up?
