1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vanyuwa [196]
3 years ago
12

A regression of y = calcium content (g/L) on x = dissolved material (mg/cm2) was reported in the article "Use of Fly Ash or Sili

ca Fume to Increase the Resistance of Concrete to Feed Acids" (Mag. Concrete Res., 1997: 337–344). The equation of the estimated regression line was y = 3.678 + .144x, with r2 = .860, based on n = 23.
a. Interpret the estimated slope .144 and the coefficient of determination .860.
b. Calculate a point estimate of the true average calcium content when the amount of dissolved material is 50 mg/cm2.
c. The value of total sum of squares was SST = 320.398. Calculate an estimate of the error standard deviation σ in the simple linear regression model.
Mathematics
1 answer:
MatroZZZ [7]3 years ago
6 0

Answer:

a) The slope = 0.144 , means that an increase in dissolved material by 1 mg/cm^2 will lead to an increase in Calcium content by 0.144 g/l

while the coefficient of determination = 0.869 , means that 86% of the variation ( natural ) of calcium content is explainable using the Linear model.

b) 10.878

c) S ≈ 1.99

Step-by-step explanation:

a) The slope = 0.144 , means that an increase in dissolved material by 1 mg/cm^2 will lead to an increase in Calcium content by 0.144 g/l

while the coefficient of determination = 0.869 , means that 86% of the variation ( natural ) of calcium content is explainable using the Linear model.

<u>B) Point estimate of true average calcium content </u>

Given that dissolved material = 50 mg/cm^2

= 3.678 + 0.144 * dissolved material

=  3.678 + 7.2 =  10.878

<u>C) Determine an estimate of error standard deviation </u>

Given that ; sum of squares ( SST ) = 320.398

                   COD ( r )  = 0.86

first;  calculate the value of SSE = SST - SST ( r^2 )

SSE = 320.398 - 320.398 ( 0.86) ^2

       = 83.43

Finally ; determine the estimate of error standard deviation

S^2 = SSE / n -2

      = 83.43 / 23 - 2

∴ S ≈ 1.99

You might be interested in
Which expression is the best estimate of 1.25 + (-2.69)?
jok3333 [9.3K]

Answer: 1+(-3)

Because you round the numbers, anything below 5 is rounded to 0 and anything 5 or above is rounded up. like 1.2 is 1, and 5.7 is 6.

7 0
2 years ago
4. To be linear means to have a constant (the same)
viva [34]
It post to be 2.x4=x1
3 0
3 years ago
Can someone help with numbers 1 and 2 for both of them tell me the answer and how you get it
Pani-rosa [81]

Answer:

Here a = 20,, b= 8

Step-by-step explanation:

Using Pythagoras theorem,

a^2 + 15^2 = 25^2 ,, b^2 + 6^2 =10^2=100

8 0
2 years ago
Read 2 more answers
PLEASEEEEEEEE HELPPPPPPPPPPPPPPPPPPP MEEEEEEEEEEEEEE PLEASEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
Alecsey [184]

Answer:

1

14

The answer is one over fourteen because there are 8 white eggs (remember the 10 brown eggs), and half of them (the white ones) are cracked, so four. And, if you randomly grab an egg, there is 1/14 of a chance you could grab a cracked, white, egg.

7 0
3 years ago
Someone please help asap with workings
antiseptic1488 [7]
I don't know how much money
3 0
2 years ago
Other questions:
  • −3(2−0.4y)+5.6=0.4(3y+1)
    9·1 answer
  • Whats the mean 15,22,19,20,29,18,25,19,31
    6·1 answer
  • Professor smith conducted a class exercise in which students ran a computer program to generate random samples from a population
    11·1 answer
  • The price of a calculator has decreased from $200 to $150. What is the percentage of decrease?
    13·2 answers
  • If the legs of a right triangle have length 6 inches and 8 inches, what is the length of the hypotenuse in
    15·1 answer
  • Solve (-6 - 4) = (-5) =
    15·1 answer
  • Can somebody help due at 10AM
    5·2 answers
  • Gabby,a college student,headed home for thaksgiving.He rode his bike at a speed of 18 miles per hour to the town where his two s
    8·1 answer
  • A group of 5 students was asked, "How many hours did you watch television last week?" Here are their responses:
    9·1 answer
  • PLSSSS HELP MEEE!!!!!! WIL MARK BRAINLIEST
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!