-Anyone wanna help a sister out??-
2 answers:
Answer:
Option A - The researcher made an error because −1 ≤ r ≤ 1.
Step-by-step explanation:
Given : A researcher is trying to find out if there is a correlation between the U.S. economy and the number of hours spent on social media. The researcher determines that the correlation coefficient is r = 1.26.
To find : What does this value mean?
Solution :
By definition of correlation coefficient,
The correlation coefficient r measures the strength and direction of a linear relationship between two variables on a scatter plot.
The value of r is always between +1 and –1 i.e,
According to researcher,
The correlation coefficient is r = 1.26 >1
So, From the options it means
The researcher made an error because −1 ≤ r ≤ 1.
Therefore, Option A is correct.
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Step-by-step explanation:
The equation is given by :
63.25=800r+3.50
Here,
63.25 is the electric company charges
3.5 is an administrative fee
800 is charge per kilowatt hours
r is rate per kilowatt hour
In this proble, we need to tell that what does r represents. Hence, r shows kilowatt per hour.
We can solve it as follows :
63.25-3.5=800r+3.50-3.50 (Subtracting 3.50 to the both sides)
59.75=800r