Answer:
Systematic sampling
Step-by-step explanation:
An EPA contractor needing to test the concentration of a substance in ten samples out seventy samples provided form a single source at regular time intervals.
For the contractor to effectively carry out the testing he has to employ a Non-probability system of sampling which is called Systematic sampling, because in systematic sampling we can assume the population size (x ) which in this case is 70 and the sample size( n ) to be 10
He will have to select ; ( x / n )^th of the sampling frame for best results
Step-by-step explanation:
x = 7
.........................
For this case we have that by definition, the equation of a line in the slope-intersection form is given by:
Where:
m: It's the slope
b: It is the cut-off point with the y axis
By definition, if two lines are parallel then their slopes are equal. A line parallel to, will have the same slope -3. Thus, the equation will be of the form:
We substitute the given point and find "b":
Finally, the equation is:
Answer:
(y2-y1)/(x2-x1)
(-7-5)/(4-2)
-12/2= -6
Answer: d) 2.5
<u>Step-by-step explanation:</u>
The mean is 16 so it has a z-score is 0
The standard deviation is 4 so:
- z-score of 1 is: 16 + 4 = 20
- z-score of 2 is: 20 + 4 = 24
- z-score of 3 is: 24 + 4 = 28
Notice that 26 is between the z-scores of 2 and 3 = 2.5
Algebraically: