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
Zielflug [23.3K]
3 years ago
14

An experiment will be conducted to test the effectiveness of a weight-loss supplement. Volunteers will be randomly assigned to t

ake either the supplement or a placebo for 90 days, with 12 volunteers in each group. The subjects will not know which treatment they receive. At the end of the experiment, researchers plan to calculate the mean weight loss for each of the two groups and to construct a two-sample t-confidence interval for the difference of the two treatment means. Which of the following assumptions is necessary for the confidence interval to be valid?
a. The sample size is greater than or equal to 10 percent of the population size.
b. Each of the two groups has at least 5 successes and at least 5 failures.
c. The distributions of weight loss of the two treatments are approximately normally distributed.
d. The volunteers in the supplement group are paired with volunteers in the placebo group.
e. The expected number of people who lose weight in each group is at least 5.
Mathematics
1 answer:
DerKrebs [107]3 years ago
3 0

Answer:

Option c. The distributions of weight loss of the two treatments are approximately normally distributed.

Step-by-step explanation:

To increase the confidence level, the results must be able to satisfy the following conditions:

  • The sample size is increased. This reduces the margin of the error in the sampling experiment.
  • Reduction of the variability. This means that the less the data varies, the more precise the data is.
  • Using the one-sided confidence level
  • Lowering the confidence level.

All these characteristics can only be satisfied by the normal distribution curve.

You might be interested in
A quarter back is sacked for loss of 5 yards. Then the team gains 12 yards. What integer can be used to explain the net gain or
bonufazy [111]
The integer is obviously 12
7 0
3 years ago
Question 2.what is the probability that between 80 and 115 complaints are received in one week? use a n(110,20) model to approxi
AURORKA [14]

Calculate standard  Z values for the given data:-

z = (80 - 110) / 20 = - 3/2 = -1.5

and z = (115 - 110) / 20 =  0.25

so we need  Prob ( -1.5 < z < 0.25)

Using standard tables this  comes to 0.5319  Answer


6 0
3 years ago
Select all of the reflections that will carry the rectangle onto itself
agasfer [191]

Answer:

B and E

Step-by-step explanation:

5 0
3 years ago
The temperature at the core of the Sun is estimated to be more than 15,000,000 degrees Celsius. What is 15,000,000 written in sc
Ronch [10]
The answer is C because you would move the decimal 7 places to the right to get 15,000,000.
6 0
3 years ago
............... help me please i don’t understand this
Sergio [31]

Answer:

x = 11

Step-by-step explanation:

3 0
3 years ago
Other questions:
  • What is (-8)(-8)(-1)?
    15·2 answers
  • Who was the first president of the United States
    9·2 answers
  • Put It Together Sean and Rachel were both born on April 17. When Sean was 4, his
    12·2 answers
  • which is the correct simplified version of the expression shown after distrubuting and combining like terms? 1/3(9x-15)+2x​
    10·1 answer
  • Solve by completing the square. x^2-10x-5=28
    11·2 answers
  • A recreational court is twice as long as it is wide. If the perimeter is 210 ft, find the dimensions of the court.
    10·1 answer
  • How many solutions can be found for the equation −4x − 11 = 2(x − 3x) + 13?
    11·2 answers
  • Three runners in a relay race share the 8-mile distance equally. How many miles does each runner travel?
    10·1 answer
  • Suppose you have a right triangle with side lengths 26, 24, and 10. Which lengths
    9·1 answer
  • Which graph represents the solution<br><br>8 - 3x ≥ -4​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!