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
Svet_ta [14]
3 years ago
6

In a test of the effectiveness of garlic for lowering​ cholesterol, 4545 subjects were treated with garlic in a processed tablet

form. Cholesterol levels were measured before and after the treatment. The changes ​(beforeminus−​after) in their levels of LDL cholesterol​ (in mg/dL) have a mean of 5.15.1 and a standard deviation of 19.119.1. Construct a 9090​% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL​ cholesterol?
Mathematics
1 answer:
n200080 [17]3 years ago
7 0

Answer:

5.1 - 2.015 \frac{19.1}{\sqrt{45}}= -0.637

5.1 + 2.015 \frac{19.1}{\sqrt{45}}= 10.837

And for this case since the confidence interval contains the value 0 we don't have significant evidence that we have a net change in the levels

Step-by-step explanation:

For this case we have the following info given:

n=45 represent the sample size

\bar X= 5.1 represent the sample mean

s= 19.1 represent the sample deviation

We can calculate the confidence interval for the mean with the following formula:

\bar X \pm t_{\alpha/2} \frac{s}{\sqrt{n}}

The confidence level is 0.90 then the significance level would be \alpha=0.1 and the degrees of freedom are given by:

df= n-1 = 45-1=44

And the critical value for this case would be:

t_{\alpha/2}=2.015

And replacing we got:

5.1 - 2.015 \frac{19.1}{\sqrt{45}}= -0.637

5.1 + 2.015 \frac{19.1}{\sqrt{45}}= 10.837

And for this case since the confidence interval contains the value 0 we don't have significant evidence that we have a net change or efectiveness in the levels

You might be interested in
Help ;-; imve been stuck here for hours
shutvik [7]
Line
Angle
Line Segment
Point
Ray
(Hope this helps you)
6 0
2 years ago
What are the solutions of the quadratic equation4x*2 − 8x − 12 = 0 ?A) x = −1 and x = −3B) x = −1 and x = 3C) x = 1 and x = −3D)
blsea [12.9K]

The solutions for the given quadratic equation are x = -1 and x = 3. So, option B is correct.

<h3>What are the solutions to an equation?</h3>
  • The solutions to an equation are the one that satisfies the equation and makes it true.
  • There are different methods to solve an equation and find its solutions.
  • These solutions are also called zeros or roots of the equation.

<h3>Calculation:</h3>

The given equation is 4x² - 8x - 12 = 0

Since it is a quadratic equation, it has 2 roots or solutions.

On factorizing the given equation,

4x² - 8x - 12 = 0

⇒ 4x² - 12x + 4x -12 = 0

⇒ 4x(x - 3) + 4(x - 3) = 0

⇒ (4x + 4)(x - 3) = 0

According to the zero-product rule,

4x + 4 = 0 or x - 3 = 0

So, x = -4/4 = -1 or x = 3

Therefore, the solutions of the given equation are -1 and 3.

So, option B) x = -1 and x = 3 is correct.

Learn more about solving an equation here:

brainly.com/question/25678139

#SPJ4

5 0
2 years ago
Stella buys 6 tacos and 4 enchiladas for 52 dollars. Eliana buys 7 tacos and 9 enchilladas for 78 dollars.
Firdavs [7]

Answer:

Let tacos be x and enchiladas be y

6 tacos + 4 enchiladas = 52

becomes

6x+4y=52

^^that's our first equation

Now, the second equation

7 tacos + 9 enchiladas = 78

7x+9y = 78

^^^that's our second equation

Isolate y in the first equation:

6x+4y=52

4y=52-6x

y = (52-6x)/4

^^^Let's call this equation 3

Now, sub-in equation 3 into equation 2

*replace the y*

Equation 2: 7x+9y = 78

Sub-in

7x+ <u>9 ( (52-6x)/4)</u> = 78

Do some algebra (get your x terms on one side) and you will find your x value

7x + <u>117 - 13.5x</u> = 78

(7x-13.5x) = 78-117 *get your x terms on one side

x=6

That's the cost of one taco.

Now, find y. Pick an equation (1,2 or 3). Let's pick 3 since y is already isolated.

All you do is plug in your x value.

Equation 3: y = (52-6x)/4

y= (52 -6(6))/4

...

You should be able to solve this on your own

Step-by-step explanation:

:)) You can solve for y now

5 0
2 years ago
Kristin paid $18.60 for 3 pounds of candy.
Bezzdna [24]

Answer:

Step-by-step explanation:

Per pound of candy = 18.60 ÷ 3 = 6.2

No you cannot even buy a candy for 1

8 0
3 years ago
Read 2 more answers
I need help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1!111111111111
Marrrta [24]

Answer:

no solution

Step-by-step explanation:

6n=6n

7 0
3 years ago
Other questions:
  • Jeff is four years less than twice his nephew's
    10·2 answers
  • Which is bigger 13% or 3/25?
    14·2 answers
  • What’s the name of that shape?
    10·2 answers
  • I really need help with this Math Answer
    9·1 answer
  • Solve 0 = -1.8y + 0.72. What is y = to?<br> 1.0.4<br> 2.-0.4<br> 3.0.8<br> 4.1.8
    5·2 answers
  • What is the image of (-4,2) after a reflection over the y-axis (PLEASE SHOW STEPS PLEASE I REALLY NEED IT ASAP )
    15·1 answer
  • ∠QPS is a right angle and m∠QPR = 71°, what is m∠RPS?
    7·1 answer
  • Find the slope of the line shown on the graph. Please help! :(
    9·2 answers
  • 45 – (–32) + (–12) – |–7|
    9·2 answers
  • Mohsin purchased a 30 ounce bag of dried Turkish figs for $11.40. What is the cost per pound?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!