Select all that apply.

which of the following statements best describes a characteristic of an observational study?

the researcher imposes, for example, a treatment on the sample population and then observes their response.
the researcher determines relationships among variables.
the individuals are observed the exact way they act in real life.
it is the best method to learn about cause-effect relationships.

The individuals are observed the exact way they act in real life.

Step-by-step explanation:

There are two main types of studies in research; one is controlled or experimental and the other is observational.

In observational studies, the individuals participating in study are not manipulated or intervened or controlled in any way by the researcher.

Hence the statements best describes a characteristic of an observational study is the individuals are observed the exact way they act in real life !

according to this law, when unemployment goes up by 1%, gdp drops by 2%. in the question, unemployment rate goes from 2% to 5%, meaning unemployment goes up by 3%, so the gdp drops by 6%. thus the effect is a drop in gdp by 6%.

step-by-step explanation:

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)