5. 25 Does social rejection hurt? Exercise 37 page 109



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5.25 Does social rejection hurt? Exercise 4.37 (page 109) gives data from a study that shows that social exclusion causes “real pain.” That is, activity in an area of the brain that responds to physical pain goes up as distress from social exclusion goes up. A scatterplot shows a moderately strong linear relationship. Figure 5.8 shows Minitab regression output for these data.

a) What is the equation of the least-squares regression line for predicting brain activity from social distress score? Use the equation to predict brain activity for a social distress score of 2.0.



5.44 Predicting tropical storms. William Gray heads the Tropical Meteorology Project at Colorado State University (well away from the hurricane belt). His forecasts before each year’s hurricane season attract lots of attention. Here are data on the number of named Atlantic tropical storms predicted by Dr. Gray and the actual number of storms for the years 1984 to 2010:19

http://ebooks.bfwpub.com/ess2e/tables/5_t_un_13.gif

  • Analyze these data. How accurate are Dr. Gray’s forecasts? It asks R2 =?

  • How many tropical storms would you expect in a year when his preseason forecast calls for 16 storms? It asks what is Y-hat when x = 16?

  • *What is the effect of the disastrous 2005 season (outlier) on your answers?

In other word, Do a regression line without outlier 2005's data

*optional


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