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
olga nikolaevna [1]
2 years ago
11

A new cream was developed to reduce the irritation caused by poison ivy. To test the effectiveness, researchers put an ad online

asking for volunteers to participate in the study. One hundred subjects replied and were informed that one group would receive the new cream and the other would receive a cream with no active ingredient. All 100 subjects were exposed to poison ivy. Fifty were then assigned to the group with the new cream, and 50 were assigned to the group with the cream with no active ingredient. After three days, technicians recorded the subjects’ level of irritation.
Which of the following would benefit this experiment the most?
This experiment should be single blind. The subjects will not know which treatment they are receiving to control for the placebo effect, but the technicians need to know which group received the new cream.
This experiment should be double blind. Neither the subject nor the technician knows which group is receiving the new cream to control for the placebo effect, and the response measured is not affected.
This experiment should be single blind. The subjects know which treatment they are receiving but the technicians do not know which group received the new cream, so the response being measured is not affected.
This experiment should not use blinding. It is unethical for the subjects not to know which treatment they are receiving, placebo or new cream, and for the technicians not to know which group received which treatment.
Mathematics
1 answer:
telo118 [61]2 years ago
4 0

Answer:

Single Blind (option 1)

Step-by-step explanation:

The subjects don't know which cream they have but the technicians do.

If the subject knows which cream they have then they can be influenced by the placebo effect. If they don't know but the technicians do then the technicians will be able to look at unbiased responses from the subjects and tell if it works or not. If the technicians don't know which cream each subject has then they won't be able to learn anything from the responses. The technicians need to know which cream each subject has and the subjects can't know which cream they had.

You might be interested in
Andrew asked every tenth person at the mall how old they are. What type of sample did he form?
NARA [144]

Answer:

it is a convenience sample

Step-by-step explanation:

6 0
3 years ago
Adult entrance fees to amusement parks in the United States are normally distributed with a population standard deviation of 2.5
kondor19780726 [428]

Answer:  1.509

Step-by-step explanation:

The formula of Margin of Error for (n<30):-

E=t_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}

Given : Sample size : n= 22

Level of confidence = 0.99

Significance level : \alpha=1-0.99=0.01

Using the t-distribution table ,

Critical value : t_{n-1, \alpha/2}=t_{21,0.005}= 2.831

Standard deviation: \sigma=\text{ 2.5 dollars }

Then, we have

E=( 2.831)\dfrac{2.5}{\sqrt{22}}\approx1.509

Hence, the margin of error for a 99% confidence interval for the population mean =1.509

4 0
3 years ago
A tree cast a shadow that is 20 feet long. Frank is 6 feet tall, and while standing next to the tree he cast a shadow that is 4
baherus [9]
A.  So we know that a 6 foot figure casts a shadow 4 feet long.  4 foot shadow x 5 = a 20 foot shadow.  So this means we take 6 x 5 = 30, and the tree is 30 feet tall.  
B.  30 - 6 = 24 feet taller than Frank 
8 0
3 years ago
Read 2 more answers
I need the answer for −n+(−4)−(−4n)+6
antoniya [11.8K]
The answer for <span>−n+(−4)−(−4n)+6 is 2

</span>
5 0
3 years ago
1. Find the volume of both right cylinders.
sergey [27]
1.) 1205.76
2.)653.12
6 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone please help meee!???
    7·1 answer
  • The formula for the area A of a triangle is A=(1/2)bh, where b is the length of the base and h is the height. Rearrange the form
    9·1 answer
  • A cylinder with a height of 12 cm is inscribed in a sphere with a radius of 10 cm. Find the lateral area of the cylinder. Answer
    15·1 answer
  • Out of 24 students 1/3 like soccer how many students is that
    13·1 answer
  • 3 over 15 space cross times space 13 over 15 space equals
    15·1 answer
  • At the annual fair in Springfield, the entrance fee $20 and every ride requires a $3
    9·2 answers
  • Two lines intersect at point B, which is also the endpoint of two rays.
    15·1 answer
  • Can someone help :(!
    5·2 answers
  • What is 7 ÷ 8465 remainder needed pls help!!!:)
    12·1 answer
  • Solve the problem.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!