Concept explainers
For the data sets in Exercises 19–26,
(a) Draw a
(b) Find the value for r.
(c) Test the significance of r at the 5% level and at the 1% level.
(d) Find the equation of the regression line and draw the line on the scatter plot, but only if r is significant.
(e) Describe the nature of the relationship if one exists.
(f) Make the requested prediction using your regression line if possible.
23. A statistics instructor plans to sec if there’s a relationship between the final exam score in Statistics 102 and the final exam scores of the same students who took Statistics 101.
Stat 101, x | 87 | 92 | 68 | 72 | 95 | 78 | 83 | 98 |
Stat 102, y | 83 | 88 | 70 | 74 | 90 | 74 | 83 | 99 |
Predict the slat 102 score for a student who got 90 on the stat 101 final.
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