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
Helga [31]
3 years ago
7

A clinical trial was conducted to test the effectiveness of the drug zopiclone for treating insomnia in older subjects. Before t

reatment with zopiclone, 16 subjects had a mean wake time of 102.8 minutes. After treatment with zopiclone, the 16 subjects had a mean wake time of 98.9 minutes and s standard deviation of 42.3 minutes. Assume that the 16 sample values appear to be from a normally distributed population and construct a 98% confidence interval estimate of the mean wake time for a population with zopiclone treatments. What does the result suggest about the mean wake time of 102.8 minutes before the treatment? Does zopiclone appear to be effective?
Mathematics
1 answer:
aleksklad [387]3 years ago
7 0

Answer:

We cannot say that the mean wake time are different before and after the treatment, with 98% certainty. So the zopiclone doesn't appear to be effective.

Step-by-step explanation:

The goal of this analysis is to determine if the mean wake time before the treatment is statistically significant. The question informed us the mean wake time before and after the treatment, the number of subjects and the standard deviation of the sample after treatment. So using the formula, we can calculate the confidence interval as following:

IC[\mu ; 98\%] = \overline{y} \pm t_{0.99,n-1}\sqrt{\frac{Var(y)}{n}}

Knowing that t_{0.99,15} = 2.602:

IC[\mu ; 98\%] = 98.9 \pm 2.602\frac{42.3}{4} \Rightarrow 98.9 \pm 27.516

IC[\mu ; 98\%] = [71.387 ; 126,416]

Note that 102.8 \in [71.384 ; 126.416] so we cannot say, with 98% confidence, that the mean wake time before treatment is different than the mean wake time after treatment. So the zopiclone doesn't appear to be effective.

You might be interested in
Consider an arbitrary ellipse x 2 a 2 + y 2 b 2 = 1. (Assume a, b > 0.) (a) Find a parametrization of the ellipse using the d
uysha [10]

Answer:

α(t) = (-a*Sin(t), b*Cos (t))    where t ∈ [0, 2π]

Step-by-step explanation:

Given an arbitrary ellipse (x²/a²) + (y²/b²) = 1       (a, b > 0)

The parametrization can be as follows

x = -a*Sin(t)

y = b*Cos (t)

then

α(t) = (-a*Sin(t), b*Cos (t))    where t ∈ [0, 2π]

If  t = 0

α(0) = (-a*Sin(0), b*Cos (0)) = (0, b)

If  t = π/2

α(π/2) = (-a*Sin(π/2), b*Cos (π/2)) = (-a, 0)

If  t = π

α(π) = (-a*Sin(π), b*Cos (π)) = (0, -b)

If  t = 3π/2

α(3π/2) = (-a*Sin(3π/2), b*Cos (3π/2)) = (a, 0)

If  t = 2π

α(2π) = (-a*Sin(2π), b*Cos (2π)) = (0, b)

We can see the sketch in the pic.

7 0
3 years ago
Read 2 more answers
Guys help plz a whipe number hás a denominator of.....
Fantom [35]
A whole number has a denominator of 1
5 0
3 years ago
Z=32+41.9i
n200080 [17]
A. Re(z)= 32 and Im(z)= 41.9

The real part of a complex number z=a+bi is ‘a’, and the imaginary part is ‘b’
6 0
2 years ago
What is the area of a circle whose radius is r?
Evgen [1.6K]

Answer:

Area of circle = πr^2

Area of circle when diameter is 2x; r=x

=πx^2

7 0
3 years ago
What is 1 3/4 + 4 7/12 as a mixed fraction??
N76 [4]
Convert to base 12:

1 9/12+4 7/12

Then, add!:

5 16/12=6 4/12 =6 1/3

The answer is 6 1/3.
7 0
3 years ago
Other questions:
  • Naomi and Claire are painting a mural. Naomi paints 2 square feet per hour and has already painted 16.5 square feet.
    6·1 answer
  • PLEASE I REALLY NEED HELP ASAP I DON'T UNDERSTAND
    10·2 answers
  • Mark just landed a great job as an engineer where he will make $65,000 a year. The company he will work for guarantees a 2% pay
    10·1 answer
  • Need help on 6 please
    9·2 answers
  • 500
    13·1 answer
  • Dmitri brought 28 ounces of trail mix for $3.92. What is the unit rate?
    10·1 answer
  • Which statement describes the translation of y = −1 over 5(x + 5)2 + 2 from standard position?
    8·1 answer
  • 2-Bromo-3-methyl pentanoic acid​
    7·1 answer
  • Solve for x and then find the length of each segment. The measure of segment is equal to the sum of its smaller parts
    6·1 answer
  • Find each angle in radians without using a calculator need some help with it, thanks!
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!