A) There are 390 people in Terminal 2 of an airport. The table below shows how many people are travelling to each destination.
Destination Number of travellers
Naples 130
Barcelona 98
Paris 78
Liverpool 84

For a sample of 30 participants, describe how a sample could be obtained using a stratified
sampling process

To obtain a stratified sample of 30 participants, we divide the people according to their destination, ending up with four groups(Naples, Liverpool, Barcelona, Paris). Finally, we choose some members each of those groups. Adding the members choosing from all groups, we have 30 members.

Step-by-step explanation:

Samples may be classified as:

Convenient: Sample drawn from a conveniently available pool.

Random: Basically, put all the options into a hat and drawn some of them.

Systematic: Every kth element is taken. For example, you want to survey something on the street, you interview every 5th person, for example.

Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.

Stratified: Also divides the population into groups. However, then only some elements of the group are surveyed.

In this question:

A stratified sample divided all the people into groups, and then surveyes some elements(some people) of each group.

Population: 390 people in the terminal.

Groups: 4 groups. Those traveling to Naples, those traveling to Barcelona, those traveling to Paris and those traveling to Liverpool.

Stratified sample of 30:

To obtain a stratified sample of 30 participants, we divide the people according to their destination, ending up with four groups(Naples, Liverpool, Barcelona, Paris). Finally, we choose some members each of those groups. Adding the members choosing from all groups, we have 30 members.

2 and 1.

step-by-step explanation:

plug in each answer. 0 doesn't work, 1 does. so does 2. 4 doesn't:

0 = 1 is not true.

2 = 2 is true.

4 = 4 is true.

8 = 16 is not true.

hope this !

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8