Question: 5.40 Global warming. Exercise 4.44 (page 124) gives data on annual average global temperatures for the last 22 years in degrees Celsius. GTEMPS (a) Find

5.40 Global warming. Exercise 4.44 (page 124) gives data on annual average global temperatures for the last 22 years in degrees Celsius. GTEMPS

(a) Find the least-squares regression line for predicting average global temperature from year. Make a scatterplot and draw your line on the plot.

(b) Explain in words what the slope of the regression line tells us.

(c) An environmentalist uses the line, based on the 20 years, to predict average global temperatures in 2050. What is the prediction? How reliable do you think your prediction is?

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