Answer:
1 and 3 are biased
Step-by-step explanation:
A biased sample is ond where all individuals were not given equal likelihood of being selected.
Number 1;
Picking students from the cafeteria would lead to sampling bias because not every student from the school eats from the cafeteria. Those she selected can not be used to account for the whole school. Those that use the cafeteria are only a representation of the whole school and not the entire school.
For number 3:
Paul is interested in finding the mean number of cloth shoppers In a mall and is only collecting data from one clothing store without considering other stores in the mall.
Answer:
80
Step-by-step explanation:
80 is divisible by all of the factors given.
Answer:
49 cm²
Step-by-step explanation:
The volume (V) of a cube is calculated as
V = s³ ← s is the length of the side, thus
s³ = 343 ( take the cube root of both sides )
s = ![\sqrt[3]{343}](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7B343%7D)
= 7, thus
area of base = s² = 7² = 49 cm²
The sampling that Joan is using is known as cluster sampling.
<h3>What is sampling?</h3>
It should be noted that sampling simply neans when a sample of a population is taken in order to illustrate the characteristics of the entire population.
In this case, the sampling that Joan is using is known as cluster sampling. This was depicted as she randomly select 10 flights from all available data in the past year.
Learn more about sampling on:
brainly.com/question/17831271
#SPJ1
