MATHEMATICS MIDDLE SCHOOL

The effect of the time of day a science class is taught on test scores is beingstudied in an experiment. Giving every student in the experiment the same
final exam is an example of which experimental design principle?

A. Randomization
B. Blocking
C. Direct control
D. Replication

Answers

Answer 1
Answer:

Answer:replication

Step-by-step explanation:
Answer 2
Answer:

Final answer:

In the experiment, giving every student the same final exam is an example of direct control. This experimental design principle ensures that all other variables are kept constant so that any differences in the outcome can be attributed only to the variable being tested.

Explanation:

In this experiment studying the effect of the time of day a science class is taught on test scores, giving every student in the experiment the same final exam is an example of the experimental design principle known as direct control. The direct control principle ensures that all other variables except the one being tested (in this case, the time of day) are kept constant. This is done to make sure that any differences observed in the outcome (the test scores in this case) can be attributed only to the variable being tested. Therefore, all students taking the same exam ensures that the difficulty of the test doesn't affect the results.

Learn more about Direct Control here:

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Mr.and Mrs.Baker place 12-inch rulers end- to-end along the entire length of a rug.they each use 3rulers.about how many feet long is the rug?

Can someone please help to answer this question

Answers

The relationship between the diameter of the tree trunk snd the height of the tree is as the diameter increases the tree will get taller therefor the height will increase too. As you can see on the scatter graph the points are going in a upwards slant meaning its increasing.
So your graph shows that the diameter of the tree trunk is increasing, because the numbers on the x axis are going up. It also shows that the tree is getting taller because the numbers are increasing on the y axis as well. So the relationship would be that the taller the tree gets, the larger the diameter of the trunk is. Does that make sense? If you need any more help, feel free to message me :)

Original price $110 new price$96. What is the percent change?

Answers

110-96=4
4/110=x/100
400/110=x
x=3.64% (when rounded to the nearest hundredth)

432 square feet 2/3 is with what's the length

Answers

432 divide by 3. then multiply by two equals 288.

colby and jaquan are growing bacteria in an experiment in a laboratory. Colby starts with 50 bacteria in his culture and the number of bacteria doubles every two hours. Jaquan has a different type of bacteria that doubles every three hours. How many bacteria should Jaquan start with so that they have they have the same amount at the end of the day?

Answers

To get started, we will use the general formula for bacteria growth/decay problems:

A_(f) = A_(i) ( e^(kt) )

where: 
A_{f} = Final amount
A_{i} = Initial amount
k = growth rate constant
t = time


For doubling problems, the general formula can be shortened to:

kt = ln(2)

Now, we can use the shortened formula to calculate the growth rate constant of both bacteria:

Colby (1):
k_(1) = ln(2)/t
k_(1) = ln(2)/2 = 0.34657 per hour

Jaquan (2):
k_(2) = ln(2)/t
k_(2) = ln(2)/3 = 0.23105 per hour

Using Colby's rate constant, we can use the general formula to calculate for Colby's final amount after 1 day (24 hours).

Note: All units must be constant, so convert day to hours.

A_(f1) = 50( e^(0.34657(24)))
A_(f1) = 204,800

Remember that the final amount for both bacteria must be the same after 24 hours. Again, using the general formula, we can calculate the initial amount of bacteria that Jaquan needs:

A_(f2) = 204,800 = A_(i2) ( e^(0.23105(24)) )
A_(i2) = 800

Write an expression for the calculation double 5 and then multiply 3

Answers

Double 5 is 2×5
Multiply 3 is ×3

So we put them together to get the expression. Pay attention though, it says double 5 THEN multiply 3. The way we make sure that double 5 comes first is by surrounding it by parentheses. The final expression is...

(2×5) × 3

Is 4.7 a rational number?

Answers

Answer:

Yes.

Step-by-step explanation:

4.7 is able to be written as a fraction, being a rational number.

Hope it helps!!

Let me know if I'm wrong...
yes 4.7 is a rational number because it is not a fraction or imaginary number
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