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.
26. For seven randomly selected cities, the violent crime rate (per 100,000 residents) in 2011 and the average high temperature in January arc displayed. Is there a connection?
Avg. Jan. high, x | 51.0 | 56.8 | 34.3 | 66.3 | 38 | 45 | 31 |
Crime rate | 613 | 575 | 485 | 559 | 1,029 | 541 | 904 |
Predict the crime rate for a city with an average high temperature in January of 28°.
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