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valentinak56 [21]
3 years ago
15

PLEASE HELP, i will mark brainliest if you show work!

Mathematics
1 answer:
ArbitrLikvidat [17]3 years ago
6 0
Jack would have $9,317 more than Henry. I can’t really show work, sorry
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What is the value of the correlation coefficient r of the data set?
enyata [817]

The correct option will be:  C) 0.84

<u><em>Explanation</em></u>

Formula for Correlation coefficient :

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

First, for each point(x, y), we need to calculate x², y² and xy .

Then, we will find sum all x, y, x², y² and xy, which gives us Σx, Σy, Σx², ∑y² and Σxy

<em>(Please refer to the attached image for the table )</em>

Here we got, ∑x = 44 , ∑y = 183 , ∑x² = 362 , ∑y² = 6575 and ∑xy = 1480

'n' is the total number of data set, which is 7 here.

So, plugging those values into the above formula..........

r= \frac{n(\Sigma xy)-(\Sigma x)(\Sigma y)}{\sqrt{[n\Sigma x^2-(\Sigma x)^2][n\Sigma y^2-(\Sigma y)^2]}}\\ \\ r=\frac{7(1480)-(44)(183)}{\sqrt{[7(362)-(44)^2][7(6575)-(183)^2]}}\\ \\ r=\frac{10360-8052}{\sqrt{(598)(12536)}}\\ \\ r=\frac{2308}{\sqrt{7496528}}\\ \\ r=0.84

So, the value of the correlation coefficient is 0.84

4 0
3 years ago
Read 2 more answers
My son is 9 leas than 1/2 my age. if i am 34 how old is my son?​
kirza4 [7]

Answer:

8

Step-by-step explanation:

Your son is half your age minus 9, so half of 34 is 17. 17 - 9 = 8

7 0
3 years ago
Thomas is sketching the graph of a quadratic function. he is asking his friends about how many x-intercepts his function can hav
DedPeter [7]

Answer:

C: 2; Allison, Richard, and Hope are right because the graph can have 0,1, or 2 x-intercepts.

7 0
3 years ago
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9. Ms. Guzman started a 950-mile trip with a full tank of gas. Her 12-
ratelena [41]

Answer:

37.5 miles per gallon

Step-by-step explanation:

450/12 =37.5

this is around about how much it is

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3 years ago
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If 60 counters are the whole how many counters make two thirds
Shalnov [3]
60 counters =1
2/3 of 60
60/3 =20
20x2=40
<u><em>40 counters</em></u>

6 0
3 years ago
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