Some Field Experience in the use of an Accelerated Method in Estimating 28-Day Strength of Concrete" considered regressing y =28-day standard-cured strength (psi) against x =accelerated strength (psi). Suppose the equation of the true regression line is y =1800 +1.3x.

a. What is the expected value of 28-day strength when accelerated strength= 2500? (2 marks)

b. By how much can we expect 28-day strength to change when accelerated strength increases by 1 psi? (4 marks)

c. Answer part (b) for an increase of 100 psi. (2 marks)

d. Answer part (b) for a decrease of 100 ps

Step-by-step explanation:

The given function is

Where represents the accelerated strength in psi, and represents 28-day standard-cured strength in psi.

Part a is about finding the y-value for

Therefore, the expected value of 28-day strength when accelerated strength is 2,500, is 5,050 psi.

Part b is about the y-value for

Part c is about the y-value for

Part d is about the y-value for

image result for what is another name for consecutive interior angles? ​

when two lines are crossed by another line (called the transversal): the pairs of angles on one side of the transversal but inside the two lines are called consecutive interior angles. in this example, these are consecutive interior angles: d and f.

step-by-step explanation:

start with a line segment pq that we will copy. mark a point r that will be one endpoint of the new line segment. set the compasses' point on the point p of the line segment to be copied. adjust the compasses' width to the point q. the compasses' width is now equal to the length of the line segment pq.

step-by-step explanation: