Please Help And NO LINKS OR U BE REPORTED!

The difference between an observational study and an experiment is that

A.) in an observational study, only one group is studied, and in an experiment, two groups are studied.
B.) in an observational study, the researchers do not control treatment, and in an experiment, they do.
C.) in an experiment, cause-and-effect is analyzed, and in an observational study, it is not.
D.) 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.

Answers

Answer 1

Answer:

I believe your answer is B


Related Questions

Pls answer and no links pls

Answers

Answer:

Step-by-step explanation:

She used 16 pints and i am 100% positive this answer is correct

Can someone please help me with this

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Answer:

I believe your answer would be -1

Step-by-step explanation:

The answer should be -1

asap please help i really need this question answered

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For A) the answer is 0.51. For B) 1445

Jersey village population in 1950 was 10,173. The population increases by 8.9% every 10 years. Predict the population in 2020

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Answer:

Future Value= 18,478 people

Step-by-step explanation:

eGiving the following information:

Present value (PV)= 10,173

Growth rate (g)= 0.089 every 10 years

Number of periods (n)= 7

To calculate the population in 2020, we need to use the following formula:

FV= PV*(1 + g)^n

FV= 10,173*(1.089^7)

FV= 18,478 people

It takes a crew 57 hours to install cabinets in one office. How long will it take the crew to install cabinets in 17 offices?

Answers

Answer:

969 hours

Step-by-step explanation:

57x17=969. It would take them 969 hours.

hey guys please i really need help and no links or u will get reported give me the correct answer please

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Answer:

a is the corect answer

Step-by-step explanation:

Please help with this Algebra II question.

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Answer:

omg im doing alg 2 next year. that looks so complicated im gunna scream

Step-by-step explanation:

A wrestling coach is entering his team in a tournament. There is a $75 fee for each team entered, plus a $5 fee for each wrestler entered.
The total cost to enter a team in a wrestling tournament can be represented by the equation f = 5w + 75, where f is the total fee and w is the
number of wrestlers entered.
if the total fee is $135, how many wrestlers does the coach enter in the tournament?
O A 12
OB. 15
OC 27
OD. 42
O E 60

Answers

Answer:

12 wrestlers

Step-by-step explanation:

First you do 135-75=60 to find the cost he payed for just the wrestlers

then each wrestlers cost 5 dollar so you do 60/5 to get a total of 12 wrestlers

Answer:12

Step-by-step explanation:

(12 points) help pls it’s sue today ;-;

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Answer:

$65

Step-by-step explanation:

x is the number of items sold, and y is the profit, so we need to calculate

y = 35x - 250

where x=9

y = 35*9 - 250 = 315 - 250 = 65

So the total profit is 65 dollars

for the data set shown in the scatterplot what is the best approximation of the slope for the line of best fit a. 5 b. 10 c. 15 D. 20

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where’s the data set?

which expression can he used to find the surface area of the following sqare pyramid​

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Answer:

answer: A

Because when doing area for triangles its

base × height ÷ 2 so for 1 triangle it would be 5 × 4 = 20 then ÷ by 2 so 20 ÷ 2 = 10 Since there are 4 triangles we will have to add 10 4 times and then for the square it's easily just 4 × 4 = 16

so it would come out to 16 + 10 + 10 + 10 + 10 =

Mrs. Roberts sewed m shirts using 2 yards of cloth for each shirt. She also sewed (m+2) dresses, using 5 yards of cloth for each dress. A) How much cloth did she use altogether? Give your answer in terms of m. B) If m= 7, find how much more cloth she used to sew the dresses than the shirts.

Answers

Answer:

7m + 10

31 yards

Step-by-step explanation:

Shirts :

Number of shirts sewed = m

Yards of cloth used per shirt = 2 yards

Number of dresses sewed = m + 2

Yards of cloth used per dress = 5 yards

Cloth used altogether :

Cloths used for shirt = 2 * m = 2m

Cloth used for dress = 5 * (m+2) = 5m + 10

2m + (5m + 10) = 7m + 10

If m = 7

Cloth used for dress - Cloth used for shirt

(5(7) + 10) - (2(7))

(35+10) - 14

45 - 14 = 31 yards

Find the volume of the solid. NO LINKS PLEASE HELP

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Answer:

Use multiplication (V = l x w x h) to find the volume of a solid figure.

Step-by-step explanation:

Please help. I just need to get this done lol.

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Answer:

1/16

Step-by-step explanation:

Work out the surface area of this solid prism.
8m
5m
3m
4m

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480 m I am guessing,.....

A sequence is given by the equation an = an-1 + 6. If a1 = 4, what is the
value of the term a3?
a.-2
b.16
o
c.12
a
d.10

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Maybe A try it
Explaining

A number cube has sides labeled 1 to 6. Hannah rolls the number cube 18 times. What is the probability of rolling a number less than 3? ​

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Answer:

1/3

Step-by-step explanation:

hope this helps!

Help!! I’m stuck and ty ❤️

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Answer:

c

Step-by-step explanation:

Because, all of them are wrong.

!!NEED THIS NOW PLS!!Expand the logarithmic expression

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Answer: B

Step-by-step explanation:

Answer:

b.............. I think

hii! please help asap. i’ll give brainliest

Answers

Answer:

Its the last one letter D.

Answer:

It's D.

Step-by-step explanation:

Hope this helped. :D

The world's largest pizza is 131 feet in diameter. What is the
area of this gigantic ple?

Answers

Answer:

1,665

Step-by-step explanation:

First find the area of the whole pizza. The diameter is given as 131 feet, so r would be 131/2 = 65.5 feet. I will use 3.14 for PI since the problem doesn't say what value to use. Each slice has an area of about 269.43 square feet and a crust length of 8.23 feet.

Please help!
6. What is the area of the shaded region created by segment BC? work. (Look closely at the picturell The 85° is only labeling the right side of the angle, NOT the whole thing) Show your work​

Answers

Answer:

13.88 square cm

Step-by-step explanation:

had it on my test :)

The area of the shaded region created by segment BC is: 13.88 cm²

What is the area of circle circumscribing a  triangle?

An imaginary tangent line stretching from the triangle's two sides plus a section of the curve that is tangent to one side create this combination. The formula for the radius of a circle enclosing a triangle is

r = ABC / 4A.

Solution:

area of sector ABC = 85/360 × π × (7.3)² cm²

                              = 39.53 cm²

area of triangle ABC = 1/2 × 9 × 5.7 cm²

                                = 25.65 cm²

area of shaded region = area of sectot ABC ₋ area of triangle ABC

                                   = 39.53 ₋ 25.65

                                   = 13.88 cm²

Hence the area of shaded region is 13.88 cm²

Learn more about Circles here-

brainly.com/question/24375372

#SPJ2

What expression is equivalent to m(n+p)

Answers

Answer:

mn + mp

Step-by-step explanation:

m(n + p) =

m(n) + m(p) =

mn + mp

Hope that helps! :)

-Aphrodite

The equivalent expression for the algebra m(n+p) is mn + mp.

What are equivalent expressions?

Equivalent expressions are similar expressions that when being solved provide the same solution. Equivalent expressions are used widely in the expansion of algebraic equations.

From the given information, we have:

=  m(n + p)

To determine the equivalent expression for the above algebraic equation, we need to expand the bracket as follows:

= m(n) + m(p)

= mn + mp

Learn more about equivalent expression here:

https://brainly.com/question/24734894

What is the largest number that divides 42 and 90​

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6 is the largest number that divides 42 and 90

20-9x+4y+7-x
Need help

Answers

Answer:

[tex]-10x + 4 y + 27[/tex]

Step-by-step explanation:

Answer: -10x+4y+27

Step-by-step explanation: first, combine the like terms

20 + 7= 27

-9x-x=-10x

4y stays the same so, if simplified this equals

-10x+2y+27

If a right triangle has side lengths of 3 cm and 7 cm, what is the length of the hypotenuse? brainliest will report if answer is not right

Answers

Answer:

Solution given:

length[a]=3cm

base(b)=7cm

hypotenuse [c]=?

we have

by using Pythagoras law

a²+b²=c²

3²+7²=c²

c=√58=7.61m

the length of the hypotenuse is 7.61 or 7.6 or8m.

Let that be x

Use Pythagorean theorem

x²=3²+7²x²=9+49x²=58x=√58x=7.61cm

CAN SOMEONE HELP ME PLEASE

Answers

Answer:

Step-by-step explanation:

the last choice,  bottom right, looks good

What is the difference from 6/12 and 9/18

Answers

Answer:

6/12 - 9/18 = 0

Difference usually means subtract.

John has coins in a jar. Five of the coins are pennies, 8 are dimes, and 3 are
quarters. John randomly selects a coin from the jar and without replacing it
randomly selects another coin. What is the probability that he selects a dime and
then a quarter?

Answers

1/8 or .125 is the answer

The probability that he selects a dime and then a quarter without replacement is 1/10

What is probability?

Probability is a measure of the likelihood of an event occurring. The probability formula is defined as the possibility of an event happening is equal to the ratio of the number of favorable outcomes and the total number of outcomes. Probability of event to happen P(E) = Number of favorable outcomes/Total Number of outcomes.

Given here: John has 8 dimes 5 pennies and 3 quarters.

Total number of coins that John has is =8+5+3

                                                                =16

Thus the probability of picking a dime is P(dime)= 8/16

                                                                                 =1/2

Therefore the conditional probability that John picks a dime and then a quarter is given by

P(dime/quarter)=1/2×3/15  ( As the dime picked is not replaced)

                         =1/10

Hence, the probability that he selects a dime and then a quarter without replacement is 1/10

Learn more about probability here:

https://brainly.com/question/30034780

#SPJ2

Malik got a 200 cafe gift on January 1. He always orders decaf mochas which cost 5 each. At the end of January, maliks gift card has 125 left. Write an equation with x as your variable.

Answers

Answer:

200 - 5x = 125

Step-by-step explanation:

Let the number of orders made by Malik in the month of January = x

Each order costs = $5

Total cost of decaf mochas in one order = $5x

Malik had cake gift on 1st of January = $200

Amount of money left with Malik at the end of January = $125

Therefore, equation representing this situation will be,

200 - 5x = 125

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