What does the expression 3x+4y equal

Find the end time<br><br>start time - 8;15AM<br>Elapsed time: 30h 20mins

Scilla [17]

The answer would be 2:35 pm

3 0

3 years ago

The correlation between the height and weight of children aged 6 to 9 is found to be about r = 0.8. Suppose we use the height x

Andrew [12]

Answer:

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

The value of r is always between $-1 \leq r \leq 1$

And we have another measure related to the correlation coefficient called the R square and this value measures the % of variance explained between the two variables of interest, and for this case we have:

$r^2 = 0.8^2 = 0.64$

So then the best conclusion for this case would be:

c. the fraction of variation in weights explained by the least-squares regression line of weight on height is 0.64.

Step-by-step explanation:

For this case we know that the correlation between the height and weight of children aged 6 to 9 is found to be about r = 0.8. And we know that we use the height x of a child to predict the weight y of the child

We need to rememeber that the correlation is a measure of dispersion of the data and is given by this formula:

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

The value of r is always between $-1 \leq r \leq 1$

And we have another measure related to the correlation coefficient called the R square and this value measures the % of variance explained between the two variables of interest, and for this case we have:

$r^2 = 0.8^2 = 0.64$

So then the best conclusion for this case would be:

c. the fraction of variation in weights explained by the least-squares regression line of weight on height is 0.64.

3 0

3 years ago

What is 27 divided by 10^-5

Ahat [919]

10^-5 = 0.00001

27 divided by 0.0001=2700000

3 0

4 years ago

A bakery uses 70% of its milk in one week. They now have 36 quarts of milk left. rt C There are 4 quarts in a gallon. How many g

marysya [2.9K]

Answer:

21

Step-by-step explanation:

8 0

3 years ago

What is the answer to<br>2x+3=7

Natali5045456 [20]

2x=4 divide 4 by 2 x=2

6 0

3 years ago