In a study to determine the relationship between ambient outdoor temperature and the rate of evaporation of water from soil, measurements of average daytime temperature in —¦C and evaporation in mm/day were taken for 40 days. The results are shown in the following table.

a. Compute the least-squares line for predicting evaporation (y) from temperature (x).
b. Compute 95% confidence intervals for β0 and β1.
c. Predict the evaporation rate when the temperature is 20—¦C.
d. Find a 95% confidence interval for the mean evaporation rate for all days with a temperature of 20—¦C.
e. Find a 95% prediction interval for the evaporation rate on a given day with a temperature of 20—¦C.

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