Answered

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Professor Izadi is interested in determining the association between sleep and
cognitive performance. He surveyed his students about the number of hours they
slept the night before an exam and then correlated these scores with their test
grades. He found a +.81 correlation between these two variables. What does this
result mean?
Multiple Choice
О
There is a low negative correlation between hours of sleep
and exam performance.
О There is a high negative correlation between hours of
sleep and exam performance.
О
There is a low positive correlation between hours of sleep
and exam performance.
О
There is a high positive correlation between hours of sleep
and exam performance.

Sagot :

GinnyAnswer

Final answer:

A high positive correlation of +.81 suggests a direct relationship between hours of sleep and exam performance.


Explanation:

Positive correlation indicates a direct relationship where as one variable increases, the other also increases. In this case, a correlation coefficient of +.81 signifies a high positive correlation between the number of hours slept the night before an exam and test grades.


Learn more about correlation coefficient here:

https://brainly.com/question/43672234


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