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
o-na [289]
3 years ago
10

In an experiment to measure the effect of fluoride "varnish" on the incidence of tooth cavities, 34

Mathematics
1 answer:
EleoNora [17]3 years ago
6 0

Answer:

Option a is right

a) Since the subjects were not randomly selected for the study, we cannot conclude that a reduction in cavities can be attributed to the fluoride treatment.

Step-by-step explanation:

Given that in an experiment to measure the effect of fluoride "varnish" on the incidence of tooth cavities, 34  10-year-old-girls whose parents volunteered them for the study were raOne group was given fluoride varnish annually for 4 years along with a standard dental hygiene regimen;

the other group only followed the standard dental hygiene regimen.

The mean number of cavities in the two groups was compared at the end of the treatments. ndomly assigned to two groups.

Because they have selected 34 volunteers, the sample is not selected at random.  This is biased one.  Also sample size is very small compared to 10 year old girls in the world.

a) Since the subjects were not randomly selected for the study, we cannot conclude that a reduction in cavities can be attributed to the fluoride treatment.

is the right answer

You might be interested in
Which of the following is algebraically equivalent to the sum of 4x^2 -8x +7 And 3x^2-2x-5
VARVARA [1.3K]

All you have to do, is combine like terms. Let's go through it:

(4x^2-8x+7)+(3x^2-2x-5)

Arrange it so you can easily combine like terms:

4x^2+3x^2-8x-2x+7-5 = 7x^2-10x+2

So, your answer for the sum is 1) 7x² - 10x + 2

5 0
3 years ago
2x - 3 = - ( 4x + 9 )
mafiozo [28]

2x-3 = -(4x+9)

2x-3 = -4x-9

2x+4x=3-9

6x=-6

x=-1

3 0
3 years ago
6n-3&gt;-18<br> Solve the inequality
Tamiku [17]

Answer:

<h3>n>-5/2</h3>

Step-by-step explanation:

First, you have to isolate it on one side of the equation. Remember that, isolate n on one side of the equation.

6n-3>-18

6n-3+3>-18+3 (Add 3 from both sides.)

-18+3 (Solve.)

-18+3=-15

6n>-15

6n/6>-15/6 (Divide by 6 from both sides.)

-15/6 (Solve.)

-15/6=-5/2

n>-5/2

In conclusion, the correct answer is n>-5/2.

3 0
3 years ago
How much mass does water contains?
never [62]
<span>One cup of water weighs approximately 8 ounces, which is equal to 225 grams. One cup holds 225 milliliters of water. The volume and weight of 1 cup of water are the same number under the metric system because the density of water is 1 gram per milliliter.</span>
7 0
3 years ago
What is the least common multiple (LCM) of 8 and 10?
Svet_ta [14]

Answer:

LCM (8,10) = 2 × 2 × 2 × 5 = 40

Step-by-step explanation:

Least common multiple is the smallest number that is multiple of both the given numbers.

Example: LCM of 2 and 3 is 6 .

6 is a multiple of both 2 and 3 .

Given numbers are 8 and 10

First write both in factor form,

⇒ 8 = 2 × 2 × 2

⇒ 10 = 2 × 5

We find LCM by writing common terms one times and multiplying all terms together,

Here, 2 is common to both 8 and 10 so we write it once only.

Thus, LCM (8,10) = 2 × 2 × 2 × 5 = 40.


4 0
3 years ago
Other questions:
  • Find the size of the marked angles​
    12·2 answers
  • A swimming pool, in the shape of a rectangular prism, is 50 meters long, 25 meters wide, and 3 meters deep. A liter is the same
    6·2 answers
  • A group of preschoolers has 16 boys and 6 girls.what is the ratio of girls to boys
    15·2 answers
  • A blacksmith has been studying vector calculus and wants to calculate the total mass of a curved metal fitting. Given that the m
    8·1 answer
  • (9q r+6qr +20g)+(-6qr -qr -11q-4q r)=
    11·1 answer
  • If line segments A and B are parallel, which of the following pairs of angles are not equal?
    13·2 answers
  • Which function is both continuous and differentiable for all x? I'm conflicted between A and D.
    15·2 answers
  • Now, suppose one of the roots of the polynomial function is irrational. The roots of the function are 2, <img src="https://tex.z
    10·2 answers
  • Pleaseeeeee help this is due today and I don’t know how to do thissss! Tug of War Activity
    5·1 answer
  • Samantha wants to redecorate her room. She would like to replace the carpet and needs
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!