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
wolverine [178]
2 years ago
6

Assume that you have paired values consisting of heights​ (in inches) and weights​ (in lb) from 40 randomly selected men. The li

near correlation coefficient r is 0.4450.445. Find the value of the coefficient of determination. What practical information does the coefficient of determination​ provide? Choose the correct answer below. A. The coefficient of determination is 0.8020.802. 19.819.8​% of the variation is explained by the linear​ correlation, and 80.280.2​% is explained by other factors. B. The coefficient of determination is 0.1980.198. 19.819.8​% of the variation is explained by the linear​ correlation, and 80.280.2​% is explained by other factors. C. The coefficient of determination is 0.8020.802. 80.280.2​% of the variation is explained by the linear​ correlation, and 19.819.8​% is explained by other factors. D. The coefficient of determination is 0.1980.198. 80.280.2​% of the variation is explained by the linear​ correlation, and 19.819.8​% is explained by other factors.
Mathematics
1 answer:
HACTEHA [7]2 years ago
6 0

Answer:

R^2 = r^2 = 0.445^2= 0.198

B. The coefficient of determination is 0.1980, 19.8​% of the variation is explained by the linear​ correlation, and 80.2​% is explained by other factors.

Step-by-step explanation:

Previous concepts

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.  

Solution to the problem

In order to calculate the correlation coefficient we can use this formula:  

r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}  

On this case we got that r =0.445

The determinaton coefficient is just:

R^2 = r^2 = 0.445^2= 0.198

And we can put it on % and we got 19.8%. And represent the variation explained by a linear model. The best option on this case would be:

B. The coefficient of determination is 0.1980, 19.8​% of the variation is explained by the linear​ correlation, and 80.2​% is explained by other factors.

Since the explained variation is 19.8% and the remain 100-19.8= 80.2% is explained by other factors.

You might be interested in
X − 3 ≥ 6<br><br> pls help me
Fantom [35]

Answer:

x \geq 9

Step-by-step explanation: i took a quiz with this on it

6 0
3 years ago
Read 2 more answers
NEED HELP ASAP! Triangle PQR has vertices at the following coordinates: P(0, 1), Q(3, 2), and R(5, -4). Determine wether or not
morpeh [17]
Orchards minced minister porch jochen
4 0
2 years ago
Data collected at Toronto Pearson International Airport suggests that an exponential distribution with mean value 2725hours is a
Ivan

Answer:

a) What is the probability that the duration of a particular rainfall event at this location is at least 2 hours?

We want this probability"

P(X >2) = 1-P(X\leq 2) = 1-(1- e^{-0.367 *2})=e^{-0.367 *2}= 0.48

At most 3 hours?

P(X \leq 3) = F(3) = 1-e^{-0.367*3}= 1-0.333 =0.667

b) What is the probability that rainfall duration exceeds the mean value by more than 2 standard deviations?

P(X > 2.725 + 2*5.540) = P(X>13.62) = 1-P(X

What is the probability that it is less than the mean value by more than one standard deviation?

P(X

Step-by-step explanation:

Previous concepts

The exponential distribution is "the probability distribution of the time between events in a Poisson process (a process in which events occur continuously and independently at a constant average rate). It is a particular case of the gamma distribution". The probability density function is given by:

P(X=x)=\lambda e^{-\lambda x}

The cumulative distribution for this function is given by:

F(X) = 1- e^{-\lambda x}, x\ geq 0

We know the value for the mean on this case we have that :

mean = \frac{1}{\lambda}

\lambda = \frac{1}{Mean}= \frac{1}{2.725}=0.367

Solution to the problem

Part a

What is the probability that the duration of a particular rainfall event at this location is at least 2 hours?

We want this probability"

P(X >2) = 1-P(X\leq 2) = 1-(1- e^{-0.367 *2})=e^{-0.367 *2}= 0.48

At most 3 hours?

P(X \leq 3) = F(3) = 1-e^{-0.367*3}= 1-0.333 =0.667

Part b

What is the probability that rainfall duration exceeds the mean value by more than 2 standard deviations?

The variance for the esponential distribution is given by: Var(X) =\frac{1}{\lambda^2}

And the deviation would be:

Sd(X) = \frac{1}{\lambda}= \frac{1}{0.367}= 2.725

And the mean is given by Mean = 2.725

Two deviations correspond to 5.540, so we want this probability:

P(X > 2.725 + 2*5.540) = P(X>13.62) = 1-P(X

What is the probability that it is less than the mean value by more than one standard deviation?

For this case we want this probablity:

P(X

8 0
3 years ago
What’s the answer I need helppp?!!? <br><br> Plz no files or links
nekit [7.7K]
About 13,992

Hope that helps have a good day and can I get brainlist
3 0
3 years ago
Selma had 2 L of bottle of water. She drank 450 mL. How much water was left, in milliliters?
Basile [38]

Answer:

The amount of water left is 1550 litres

7 0
3 years ago
Other questions:
  • I need as much as answers as possible and as quick as possible
    11·1 answer
  • A section of roller coaster track forms of parallelogram a b c and d if a B and C equals 72 degrees what is d a b
    6·1 answer
  • A drilling machine can drill 12 holes in 6 minutes. If the machine drills holes at a constant speed, it can drill ______ holes i
    15·2 answers
  • PLEASE HELP THIS IS DUE TODAY!!!!!!
    5·1 answer
  • 4.
    7·1 answer
  • Simplify. 12x • 3x <br> 15 x<br> 15 x2 <br> 36 x2 <br> 36 x
    13·2 answers
  • It takes Naomi 4 minutes to run 5 laps. How long does it take her to run 30 laps? Use a table, double number line, tape diagram
    9·1 answer
  • What L is alternate interior at L6?<br><br> A. L3<br> B. L5 <br> C. L1<br> D. L4
    12·1 answer
  • What is the measure of x to the nearest degree?<br> 8
    13·1 answer
  • Bet u cant answer!!!!! #9
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!