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iren2701 [21]
3 years ago
10

An airplane’s altitude changed − 378 feet over 7 minutes. What was the mean change of altitude in feet per minute?

Mathematics
1 answer:
prohojiy [21]3 years ago
6 0
The mean would be -92.75 due to the fact that -378 feet/7 minutes would equal the unit ratio of  -92.75 feet/ 1minute or a mean of -92.75
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Answer:

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We can also find the r^2 who represent the determination coefficient and we got:

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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.

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]}}  

The correlation coeffcient for this case was provided:

r =0.934

And this coefficient is very near to 1 the maximum possible value, so then we can interpret that the relationship between the entrace exam score and the grade point average are strongly linearly correlated .

We can also find the r^2 who represent the determination coefficient and we got:

r^2 = 0.934^2= 0.872

And the interpretation for this is that a linear model explains appproximately 87.2% of the variability between the two variables

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