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
Ksivusya [100]
3 years ago
6

Consider the relationship between the number of bids an item on eBay received and the item's selling price. The following is a s

ample of 5 items sold through an auction. Price in Dollars 26 29 32 38 47 Number of Bids 12 13 15 16 18 Step 3 of 3 : Calculate the correlation coefficient, r. Round your answer to three decimal places.\
Mathematics
1 answer:
n200080 [17]3 years ago
5 0

Answer:

Let's assume the following data:

Price in Dollars (X) 26 29 32 38 47

Number of Bids (Y) 12 13 15 16 18

For our case we have this:

n=10 \sum x = 172, \sum y = 74, \sum xy = 2623, \sum x^2 =6194, \sum y^2 =1118  

r=\frac{5(2623)-(172)(74)}{\sqrt{[5(6194) -(172)^2][5(1118) -(74)^2]}}=0.974  

So then the correlation coefficient would be r =0.974

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

And 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]}}  

Let's assume the following data

Price in Dollars (X) 26 29 32 38 47

Number of Bids (Y) 12 13 15 16 18

For our case we have this:

n=10 \sum x = 172, \sum y = 74, \sum xy = 2623, \sum x^2 =6194, \sum y^2 =1118  

r=\frac{5(2623)-(172)(74)}{\sqrt{[5(6194) -(172)^2][5(1118) -(74)^2]}}=0.974  

So then the correlation coefficient would be r =0.974

You might be interested in
Michael, whose eyes are five feet off the ground, is standing 26 feet away from the base of a building, and he looks up at a 65°
yawa3891 [41]

Answer:

Dear user,

Answer to your query is provided below

The building is 60.77 ft tall.

Step-by-step explanation:

Explanation is provided below in the image attached

3 0
2 years ago
Converting Explicit formula to Recursive formula.
Kruka [31]
The formula
a(n) = 2 - 5(n-1)
is in the form
a(n) = a1 + d(n-1)

where
a1 = first term = 2
d = -5 = common difference

The first term is carried over to the recursive formula. We start with a1 = 2. The next term after that is found by subtracting 5 from the previous term. So
second term = (first term) - 5
third term = (second term) - 5
and so on

The recursive step would be 
a(n) = a(n-1)-5

So that's why the answer is choice C
8 0
3 years ago
Which inequality is true when the value of x is -3?
liubo4ka [24]

Answer:

A

Step-by-step explanation:

A

3 0
2 years ago
Read 2 more answers
Help needed ASAP will give brainliest AND 5 STARS
blsea [12.9K]

Answer:

6

Step-by-step explanation:

6 0
3 years ago
How many book marks will he make with 9 feet of ribbon
Lubov Fominskaja [6]
9 ÷ 1/3 = 27

27 bookmarks
6 0
2 years ago
Read 2 more answers
Other questions:
  • Which equation represents the vertical line passing through (7,-3)?
    13·1 answer
  • Yuron is sketching a scale drawing of a famous painting. The painting is 54 inches wide and 72 inches long. He used a scale fact
    7·1 answer
  • You buy 3 new shirts for $17 each and 5 new pairs of pants for $12 each. You give the cashier $110. Which of the following is a
    15·2 answers
  • Solve each system by multiplying. Check ur answer.
    13·1 answer
  • Find the slope of the line <br> Make sure the answer is a reduced fraction<br> (4,7) (9, 10)
    10·2 answers
  • What is the point-slope form of a line that has a slope of 3 and passes through the point (–1, 4)?
    15·1 answer
  • 3x^2 – X – 2 = 0 how do I solve this by factoring​
    13·1 answer
  • At noon on Monday in Minneapolis,the temperature,in degrees Fahrenheit(F),was -4F. At noon on tuesday,the temputare was 6 degree
    15·1 answer
  • The price of a pair of jeans was reduced from $20 to $15. By what
    8·1 answer
  • Y=26-2 use a function ruler
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!