The difference between an observational study and an experiment is thatA . 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:

Answer: (b) in an observational study, the researchers do not control treatment, and in experiment, they do.

Step-by-step explanation: In an observational study, only one group is studied, but in an experiment, more than one, may be two, three, etc. are studied, so option (A) is not correct. In an observational study, researchers control treatment but in experiment they do not, and so, option (B) is also incorrect. Option (D) is not correct, because a group is studied over a longer period of time in an experiment and the group is studied over a short period of time in observational study. The only correct option is (C) because cause and effect is studied in an experiment and are not studied in an observational study.

Hence, (C) is the correct option.

Answer 2

Answer:

Answer:

Step-by-step explanation:

edge 21

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All number that are evenly divisible by both 6 and 14 are also divicible by?

Answers

2 because all even numbers are divisible by 2

6/2 = 3
14/2 = 7

These two numbers are divisible by 2.

Which numbers multiply to 50 and add to 6

Answers

xy = 50
x + y = 6

$xy = 50$
$(xy)/(x) = (50)/(x)$
$y = (50)/(x)$

$x + y = 6$
$x + (50)/(x) = 6$
$(x^(2))/(x) + (50)/(x) = 6$
$(x^(2) + 50)/(x) = 6$
$x^(2) + 50 = 6x$
$x^(2) - 6x + 50 = 0$
$x = \frac{-(-6) \± \sqrt{(-6)^(2) - 4(1)(50)}}{2(1)}$
$x = (6 \± √(36 - 100))/(2)$
$x = (6 \± √(-64))/(2)$
$x = (6 \± 8i)/(2)$
$x = 3 \± 4i$
$x = 3 + 4i$ $or$ $x = 3 - 4i$

x + y = 6
  3 + 4i + y = 6
- (3 + 4i) - (3 + 4i)
y = 3 - 4i
(x, y) = (3 + 4i, 3 - 4i)

or
  x + y = 6
  3 - 4i + y = 6
- (3 - 4i) - (3 - 4i)
y = 3 + 4i
  (x, y) = (3 - 4i, 3 + 4i)

(x, y) = (3 ± 4i, 3 ± 4i)

The two numbers that multiply to 50 and add up to 6 are 3 ± 4i.

A car rental agency charges a weekly rate of $300 for a car and anadditional charge of 5 cents for each mile driven. How much miles can
you travel in a week for $500?
5,000 miles
3,000 miles
3,500 miles
5
4,000 miles
3
4,500 miles

Answers

Answer:

4,000

Step-by-step explanation:

In a city school of 900 students, 35% of the students are on the honor roll, 63% have a part-time job, and 26% are on the honor roll and have a part-time job. What is the probability (rounded to the nearest whole percent) that a randomly selected student is on the honor roll, given that the student has a part-time job?41%
56%
16%
22%

Answers

Given:
900 students
35% are on the honor roll
63% have part-time jobs
26% are on the honor roll and have part-time jobs

What is the probability (rounded to the nearest whole percent) that a randomly selected student is on the honor roll, given that the student has a part-time job?

honor roll: 35%
part time job: 63%

35% x 63% = 22.05% or 22%

Chelsea is graphing the function f(x) = 20()x. She begins by plotting the initial value. Which graph represents her first step?ik is either c or d

Answers

we have the function

$f(x)=20((1)/(4))^(x)$

we know that

In the equation of the exponential function of the form

$f(x)=a(b)^(x)$

a is the initial value

b is the base

x is the exponent

The initial value is the value of the function when the value of x is equal to zero

in this problem

for $x=0$

$f(0)=20((1)/(4))^(0)$

$f(0)=20(1)=20$

the initial value is the point $(0,20)$

therefore

the answer in the attached figure

The answer you are looking for is C. Hope this helps!

7 times the difference of a number and 3.2 is 8.4.

Answers

because subtraction comes before multiplication on the order of operations we have to put in parenthasis in this problem.

(x-3.2) is what we have so far.

then we multiply it by 7

so 7(x-3.2)=8.4

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