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
If 5/8 of the students in a school ar boys, what is the ratio of boys to girls<br><br>​
babymother [125]

Answer:

5:3

Step-by-step explanation:

math

4 0
3 years ago
PLS HELP I WILL GIVE BRAINLIEST AND 40 POINTS
arlik [135]
Number 10:
 All angles in a triangle =180 degrees

so add the first to and subtract that by 180

166 degrees
180-166=14
so x=14 degrees 



5 0
3 years ago
Expand it <br> (2/7z -3/5x)2
svet-max [94.6K]
( 2 / 7 z - 3 / 5 x ) 2
3 0
3 years ago
Write <br> 9<br> 5<br> as a mixed number.
Advocard [28]
<span>Well, think of it this way? How many times does 5 go into 9? 

5 * 1 = 5 
5 * 2 = 10 

So 5 goes into 9 one time. Then you have to subtract that 5 from 9 to be left with your fraction value. 

1 and 4/5 is your mixed number.</span>
5 0
3 years ago
Read 2 more answers
Please help me
victus00 [196]

Answer:

The lines are perpendicular, meaning if they were to intersect, they would form four right angles.

3 0
3 years ago
Other questions:
  • Kelsey made 9 3/5 pounds of Chex mix. If she puts 4 4/5 pounds into each bag, how many bags can Kelsey fill?
    13·1 answer
  • A total of 524 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student t
    9·2 answers
  • How do you work out 2/5 of 10
    14·2 answers
  • A Chinese restaurant offers buffet takeout for $4.99 per pound. How much does your takeout meal cost if it weighs 0.65 pounds?
    15·2 answers
  • PLEASE HELP !!!!!!!! prove that segment DE is parallel to segment AB.
    8·2 answers
  • Help me with these questions please, I don’t understand scientific notation!
    12·1 answer
  • UNIT RATE <br><br><br> what is the unit rate of the of ( 3 ounces every 3/4 cup )
    14·1 answer
  • Use the net price rate to calculate the net price for 10 boxes of computer paper if the unit price is $13.59 and a single trade
    7·1 answer
  • Hjhbihvyrdetsygvihgiutfyuctfcg
    13·1 answer
  • Some red, white, and blue candies were placed in a bowl. Some contain nute,
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!