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porterdylan15
12.02.2020 •
Mathematics
It is thought that basketball teams that make too many fouls in a game tend to lose the game even if they otherwise play well. Let x be the number of fouls more than (i.e., over and above) the opposing team. Let y be the percentage of times the team with the larger number of fouls wins the game.
X= 0 2 5 6
Y= 50 45 33 26
Complete parts (a) through (e), given Σx = 16, Σy = 154, Σx2 = 78, Σy2 = 6302, Σxy = 548, and r ≈ −0.941.
a. Draw a scatter diagram displaying the data.
b. Find X- bar, Y- bar, a and b. Then find the equation of the least squares line y=a+bx.
c. Graph the least squares line on your scatter diagram. Be sure to use the point ( X-bar, Y- bar) as one of the points on the line.
d. Find the value of the coefficient of determination r ^2. What percentage of the variation in y can be explained by the corresponding variation in x and the least squares line? What percentage is unexplained?
e. If a team had x = 4 fouls over and above the opposing tem, what does the leas squares equation forecast for y?
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Ответ:
a) First figure attached
b)![\bar x= \frac{\sum x_i}{n}=\frac{16}{4}=4](/tpl/images/0508/1539/b9e7d.png)
c)![S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}=78-\frac{16^2}{4}=14](/tpl/images/0508/1539/597f3.png)
And the slope would be:
And we can find the intercept using this:
So the line would be given by:
d)![r^2 = (-0.941)^2= 0.885](/tpl/images/0508/1539/725a3.png)
So then the porcentage of variation explained is 88.5%
And the percentage of unexplained variation would be 100-88.5=11.5%
e) Using the least squares regression:
Using the excel equation with the
we have:
Step-by-step explanation:
We assume that the data is this one:
x: 0,2,5,6
y: 50,45,33,26
Part a
For this case on the figure attached we see the scatter plot of the data.
Part b
Find the least-squares line appropriate for this data.
For this case we need to calculate the slope with the following formula:
Where:
So we can find the sums like this:
With these we can find the sums:
And the slope would be:
And we can find the intercept using this:
So the line would be given by:
Part c
For this case we add the point (4.38.5) for the data and we got the equation as we can see on the figure attached.
y = -3.8578x + 51.616 (Equation adjusted with Excel)
Part d
So then the porcentage of variation explained is 88.5%
And the percentage of unexplained variation would be 100-88.5=11.5%
Part e
Using the least squares regression:
Using the excel equation with the
we have:
Ответ:
(A) The prism could be a cube with a side length of 10 mm.
(B) It is possible for the length to be 1,000 mm.
(D) It is possible that the length is 2.5 mm.
Explanation:
Volume = l×w×h
where l is the length, w is the width and h is the height
It is possible that the length is 2.5 mm
Then volume = 2.5 × 10 ×40 = 1000 mm³
It is possible for length to be 1000 mm
Then volume = 1000 × 0.1 × 10 = 1000 mm³
The prism could be a cube of length 10 mm
Then volume = 10 × 10 × 10 = 1000 mm³