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Researchers recorded the resting heart rate ( RHR ) and number of hours of exercise per week of 1 8 healthy adults. They fit a
Researchers recorded the resting heart rate RHR and number of hours of exercise per week of healthy adults. They fit a leastsquares linear regression line relating RHR in bpm and exercise:
Estimated RHRHours of Exercise
with MSE
If necessary, round your answers to the nearest thousands place decimal places
a We know that the correlation between hours of exercise and RHR must be
Equal to
Between and
Equal to
Between and
Equal to
Points possible:
b What are the degrees of freedom for this model?
c The estimated standard error for the slope of the regression line is So the variance of the original hours of exercise values is
Points possible:
d One of the individuals exercises hours per week and has RHR
According to the linear model, their RHR is expected because the point is the regression line.
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