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
Doss [256]
3 years ago
13

Which of the following statements represents one of the differences between an experiment and an observational study?

Mathematics
2 answers:
tiny-mole [99]3 years ago
5 0

Answer:

B

Step-by-step explanation:

svet-max [94.6K]3 years ago
3 0

Answer:

Introducing a change to the subgroup

Step-by-step explanation:

Given there are four statements.  We have to find the one which represents one of the differences between an experiment and an observational study.

The answer is option 2. Introducing a change to the subgroup

Experimental and observational studies are both types of studies between which a number of differences can be identified. When conducting research studies,  various types of research in order to arrive are adopted according to the need.  

An experimental study is a study where the researcher has control over most of the variables.

On the other hand, an observation study is a study where the researcher cannot control any variable but merely observes the subject without controlling any variables.

You might be interested in
(9x^4-3x^3+4x^2+5x+7) + (11x^4-4x^2-11x-9)
icang [17]

Answer:

20x^4 - 3x^3 - 6x - 2

5 0
2 years ago
Help me to answer this question
Vlad [161]
A I think usuauauauau
7 0
3 years ago
Read 2 more answers
What kinds of regular polygons can be used for regular tesselations
Ahat [919]
To tessellate a surface using a regular polygon, the interior angle must be a sub-multiple (i.e. factor) of 360 degrees to cover completely the surface.

For a regular three-sided polygon, the interior angle is (180-360/3)=60 °
       Since 6*60=360, so a regular three-sided polygon (equilateral triangle)            tessellates.
For a regular four-sided polygon, the interior angle is (180-360/4)=90 °
       Since 4*90=360, so a regular four-sided polygon (square) tessellates.
For a regular five-sided polygon, the interior angle is (180-360/5)=108 °
       Since 360/108=3.33... (not an integer), so a regular five-sided polygon           (pentagon) does NOT tessellate.
For a regular six-sided polygon, the interior angle is (180-360/6)=120 °
       Since 3*120=360, so a regular six-sided polygon (hexagon) tessellates.


5 0
3 years ago
Read 2 more answers
Flying to Kimpala with a tail wind a plane averaged 158km/hr. On the return trip the plane only average 112km/hr. While flying b
lora16 [44]

The speed of wind and speed of plane in still air  are  23  and  135 km/h respectively.

<u>Step-by-step explanation:</u>

Let the speed of wind and speed of plane in still air  are  w  and  p km/h respectively.  

The effective speed on onward journey was  

p+w=158  ................(1)

The effective speed on return journey was  

p-w=112 ..............(2)

Adding equation (1) and equation (2) we get,  

⇒ (p+w)+(p-w) = 158+112

⇒ 2p = 270

⇒ p = 135

Putting value of p = 135 in p+w=158 we get:

⇒ p+w=158

⇒ 135+w=158

⇒ w=23

Therefore ,The speed of wind and speed of plane in still air  are  23  and  135 km/h respectively.

3 0
2 years ago
Adult tickets to a play cost $1.75 each and student tickets cost $1.25 each. Suppose there are twice as many student tickets sol
Arada [10]

Answer: 200 adult tickets and 400 student tickets were sold.

Step-by-step explanation:

Let x represent the number of adult tickets that were sold.

Let y represent the number of student tickets that were sold.

Adult tickets to a play cost $1.75 each and student tickets cost $1.25 each. If the income from the play was $850, the expression would be

1.75x + 1.25y = 850- - - - - - - - - -1

Suppose there are twice as many student tickets sold as adult tickets. This is expressed as

y = 2x

Substituting y = 2x into equation 1, it becomes

1.75x + 1.25 × 2x = 850

1.75x + 2.5x = 850

4.25x = 850

x = 850/4.25

x = 200

y = 2x = 2 × 200

y = 400

6 0
3 years ago
Other questions:
  • Factor by grouping.
    11·2 answers
  • A geometric sequence has a4=4 and a5=7. What is a1?
    5·2 answers
  • Find the exact area and circumference of a circle whose diameter is 8 meters. Show your work.
    11·1 answer
  • Simplify the fraction to lowest terms 18/9 ​
    7·2 answers
  • I need help finishing this.
    10·1 answer
  • An urn contains 2 small pink balls, 7 small purple balls, and 6 small white balls.
    9·1 answer
  • Sally organizes data in a table to show the net change in the number of people subscribing and unsubscribing to her newsletter e
    6·1 answer
  • Two mechanics can assemble 10 bicycles in 8 hours. How many bicycles could one mechanic assemble in 8 hours? Use what you determ
    11·1 answer
  • BRAINLY AND 100 POINTS NO LINKS What is the length of the line segment with endpoints (−3, −8) and (10, −8) ?
    11·2 answers
  • In a manufacturing process, a random sample of 36 bolts has a mean length of 3 inches with a standard deviation of .3 inches. Wh
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!