The difference between an observational study and an experiment is that
O in an observational study, only one group is studied, and in an experiment, two groups are studied.
in an observational study, the researchers do not control treatment, and in an experiment, they do.
• in an experiment, cause-and-effect is analyzed, and in an observational study, it is not.
®
in an experiment, one group is studied over a short period of time, and in an observational study, the group is
studied over a longer period of time.

Answer:

4x+12<-8

4×<-8-12

4×<-20

×>-5

Answer:

its 6.40

Step-by-step explanation:

Answer:

2,304 years old

Step-by-step explanation:

Given: Jennifer age = 18, Invested = $1000 at 8% interest

To find: How old would she be when the account is $128,000?

Wrong solution

Solution: To figure out how old she will be when her account is $128,000, simply find the difference between her current account value by her current age, by dividing. Then multiply the result by the future account value.

Step 1: [tex]\frac{1000}{18} = 55.5555555556[/tex]

Rounding, that is; 55.56

Step 2: Now, multiply the result by the future account value.

[tex]55.56[/tex] × [tex]128000 = 7111680[/tex]

Correct solution

Solution: To find out how old she will be when her account is $128,000, set up a fraction;

[tex]\frac{1000}{8} = \frac{12800}{x}[/tex]

Step 1:  Divide the numbers

[tex]\frac{1000}{8} = \frac{128000}{x} \\\\\frac{500}{9} = \frac{128000}{x}[/tex]

Step 2: Multiply all terms by the same value to eliminate fraction denominators

[tex]\frac{500}{9} = \frac{128000}{x} \\\\x * \frac{500}{9} = x * \frac{128000}{x}[/tex]

Step 3:  Cancel multiplied terms that are in the denominator

[tex]x *\frac{500}{9} = x * \frac{128000}{x} \\\\x * \frac{500}{9} = 128000[/tex]

Step 4: Re-order terms so constants are on the left

[tex]x * \frac{500}{9} = 128000\\\\\frac{500}{9} x= 128000[/tex]

Step 5: Combine multiplied terms into a single fraction

[tex]\frac{500}{9} x = 128000\\\\\frac{500x}{9} = 128000[/tex]

Step 6: Multiply all terms by the same value to eliminate fraction denominators

[tex]\frac{500x}{9} = 128000\\\\9 * \frac{500x}{9} = 9 * 128000[/tex]

Step 7: Cancel multiplied terms that are in the denominator

[tex]9 * \frac{500x}{9} = 9 * 128000\\500

Answer:

40 for raisins

Step-by-step explanation:

3:2:5

60÷3=20 (60 comes from the nuts in the question÷3 in the ratio 3:2:5)

2×20=40

60:40:??

raisins has the weight of 40.

Answer:

36 cups of flour can be made.

Step-by-step explanation:

Answer:

27

Step-by-step explanation:

Answer:

x=2

Step-by-step explanation:

7x + 3 = 17

7x = 17 - 3

7x = 14

7x ÷ 7 = 14 ÷ 7

x = 2

Answer:

∠DFA or can be written as AFD : ( as long as the vertex F is in the middle)

Step-by-step explanation:

Supplementary angles are angles when added together form a straight line (180°)

CFD makes a small part of that straight line and DFA (AFD) make up the other part

Answer:

1. 8 edges

2. 8 vertices

Step-by-step explanation:

Answer:

the 3D image is a cuboid so no.of edges are 12 and no.of vertices are 8..

edges are the line segments and vertices are the corners...

Answer:

426 ft^2.

Step-by-step explanation:

It area = area of the rectangle + area of the triangle

= 15 * 26 + 1/2 * 8 * 9

= 390 + 1/2*8*9

= 390 + 36

= 426 ft^2.

The area of the figure given is 426 ft^2.

Find the area that its outer surfaces possess. Sum of all those surfaces' area is the surface area of the considered object.

Supposing that there is no direct formula available for deriving the area, we can derive the area of that region by dividing it into smaller pieces, whose area can be known directly.

Area = Area of the rectangle + Area of the triangle

Area = 15 * 26 + 1/2 * 8 * 9

Area = 390 + 1/2*8*9

Area = 390 + 36

Area = 426 ft^2.

Therefore, the area of the figure given is 426 ft^2.

Learn more about surface area here:

https://brainly.com/question/15096475

#SPJ5

Answer:

D) (-20, 17)

Step-by-step explanation:

y = x + 3 (substitute the numbers & check if the equation is still true)

-7 = -10 + 3 -> -7 = -7

16 = 13+3 -> 16 = 16

-11 = -14 + 3 -> -11 = -11

17 = -20 + 3 -> 17 = -17 (not true)

Answer:

30 m vertically and 10 horizontally for a rectangle in a corner of the warehouse.

Answer:

x=2, x=-8  : 2 will be taken as the answer as negative is discarded so C is the answer

Step-by-step explanation:

Apply Log Rules:

x(x+6)=16

Solve:

x=2, x=-8

Answer:

4 1/6

Step-by-step explanation:

6 goes into 25 4 times with one leftover converting to the extra 1/6th

Answer:

4 R 1

Step-by-step explanation:

Answer:

Hello! answer: A. 12 × 1/11

Answer:

A

Step-by-step explanation:

Answer: 100 inches

Step-by-step explanation: *warning* this is the way I do it. This might not be the best or easiest way, but it is an answer

30 inches wide

20 inches tall

30+30+20+20 = 100

you could also do 30*2 + 20*2

Answer:

D) 49.1 in²

Step-by-step explanation:

area of entire cake = πr² = (3.14)(5²) = 78.5 in²

area of 5 slices = (78.5)(5/8) = 49.1 in²

Answer: -3

Step-by-step explanation:

To find the gradient...

Take any two points on the line and use the gradient fromula...

y2 - y1/ x2 - x1

Using points (0, 4) and (1,1):

1-4 / 1-0 = -3/1

Graident/slope = -3

Answer:

Step-by-step explanation:

(0, 4) (1, 1)

(1 - 4)/(1 - 0) = -3/1= -3

-3 is the slope

Answer: The answer is B

Step-by-step explanation:

Answer:

Choice A: there is insufficient evidence to conclude that the mean for the fiber content is less than 2.5 gms.

Step-by-step explanation:

From the graphs given the more appropriate is one sample t- test

One sample t- test is used and the results are

Hypothesis Test                       Fiber

Sample Mean                          2.62

Sample St. Dev                       3.492

Degrees of Freedom              24

t- test statistic                         0.1718

p- value                                    0.5675

the critical region for this test at ∝= 0.05 is t < -1.711

There is not enough evidence to reject the null hypothesis.

Since the calculated t=   0.1718 does not fall in the critical region the null hypothesis is accepted that the mean fiber content is not  less than 2.5 grams.T

Answer:

55 degrees (a)

Step-by-step explanation:

complementary means they equal 90 degrees

so 90-35= 55 degrees

Answer:

I don't no the answer sorry

Answer:

A. [tex] (-3, -2) [/tex]

Step-by-step explanation:

Given:

(4, -10) and (-10, 6)

Required:

Midpoint of the two endpoints

Solution:

Apply the midpoint formula,

[tex] M(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}) [/tex]

Where,

(4, -10) = (x_1, y_1)

(-10, 6) = (x_2, y_2)

Plug in the values

[tex] M(\frac{4 + (-10)}{2}, \frac{-10 + 6}{2}) [/tex]

[tex] M(\frac{-6}{2}, \frac{-4}{2}) [/tex]

[tex] M(-3, -2) [/tex]

Answer:

The answer would be the 1st one.

Step-by-step explanation:

When you use a percentage calculator or look it up, you can shay 40 as a percent of 19 and the answer will be 47.5%. You could also divide and get your answer that way as well.

Hope that helps! If you get it wrong, please tell me so I could check my work.  Have a great rest of your day :)!

THE ANSWER IS 110 m

Workers had repaired 3/4 of the road

it means3/4×440 is been repaired

length of repaired road is 3×110 = 330m

length of unrepaired road = Length of to road - length of repaired road

i.e. = 440-330 = 110m

f Step-by-step explanatin

so you add the thing and you add this thing

stu   pid     i d i o t

Answer:

(x + 2)² + (y + 2)² = 0.75²

Step-by-step explanation:

Standard form

(x - h)² + (y - k)² = r²

the center is (h, k) = (-2, -2)

the radius is r = 0.75

(x + 2)² + (y + 2)² = 0.75²

Answer:

(x + 2)^2 + (y + 2)^2 = 0.5625

Step-by-step explanation:

By looking at the graph, we can see the center of the circle is (-2, -2) and by counting the squares, the radius is 0.75.

The standard form of a circle equation is:

(x - h)^2 + (y - k)^2 = r^2

where (h, k) is the center and r is the radius.

We can substitute our values in to get:

(x + 2)^2 + (y + 2)^2 = 0.5625

Answer:

So first you would have to divide 240 and 4.47.Then that should be 53 hours or 54 hours.If you choose 54 hours the money in total would be at 241 ruffly.

Step-by-step explanation: