Question
The data below are the number of hours slept the night before the test and the...
The data below are the number of hours slept the night before the test and the test scores of 9 randomly selected statistics students.
| Number of Absences, x | 3 | 5 | 7 | 9 | 7 | 6 | 2 | 8 | 6 |
| Test Grade %, y | 62 | 71 | 80 | 82 | 93 | 65 | 51 | 89 | 54 |
a) Find the linear correlation coefficient, rounded to the nearest ten-thousandth (4 decimal places).
b) Find the equation of the least-squares regression line. Round your values to the nearest ten-thousandth (4 decimal places).
c) Use the least-squares regression line to estimate the test grade of a person who slept for 4 hours. Round to the nearest whole number.
A person who slept for 4 hours will earn a test grade of approximately _%.
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