Answer:
The specificity of this test is expressed as:________
70%.
Step-by-step explanation:
a) Data and Calculations:
TEST RESULTS Disease Present Disease Absent Total
Positive for Factor X 40 60 100
Negative for Factor X 10 140 150
Total 50 200 250
Negative for X and Disease Absent = 140/200 * 100
= 0.7 * 100
= 70%
b) The specificity refers to the percentage of people who test negative for a specific disease among a group of people who do not have the disease. No test is 100% specific because some people who do not have the disease X will test positive for it (false positive). Therefore, we are testing for the true negative, that the 140 people who tested out of the 200 people who do not have the disease.
2.00 would be the best price to maximize revenue in the situation you gave me to answer
The perimeter is 40.6 meters and the area is 841 meters
Answer:
The width of the rectangle is 9 inches.
Step-by-step explanation:
The formula of perimeter is Perimeter = 2·length + 2·width. The length is 20. If we call "x" to the width.
Perimeter = 2·(20) + 2·x ⇒ Perimeter = 40 + 2x ⇒ 58 =40 + 2x ⇒
58 -40 =2x ⇒ 18 = 2x ⇒18/2 = x ⇒ 9 = x.
The width of the rectangle is 9 inches.
Answer: x=1
Step-by-step explanation:
Subtract 1 to both sides leaving you with x=1
