To gather information about the accuracy of a new cholesterol test, a random sample of 20 hospitals was selected from the state. The new test was administered to every patient in the selected hospitals. What kind of sample is this? A)a cluster sample
B)a simple random sample
C)a stratified random sample
D)a systematic random sample
E)a voluntary response sample

The answer is a) a cluster sample.

Step-by-step explanation:

This is because the hospitals are the randomly picked clusters.

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column