The following MINITAB output presents a 95%

confidence interval for the mean ozone level on days when the relative humidity is 60%, and a 95% prediction interval for the ozone level on a particular day when the relative humidity is 60%. The units of ozone are parts per billion.

a. What is the point estimate for the mean ozone level for days when the relative humidity is 60%?

b. What is the 95% confidence interval for the mean ozone level for days when the relative humidity is 60%?

c. Predict the ozone level for a day when the relative humidity is 60%.

d. Upon learning that the relative humidity on a certain day is 60%, someone predicts that the ozone level that day will be 80 parts per billion. Is this a reasonable prediction? If so, explain why. If not, give a reasonable range of predicted values.

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Predicted Values for New Observations New Obs 1 Fit 43.62 SE Fit 1.20 95.0% CI (41.23, 46.00) 95.0% PI (20.86, 66.37) Values of Predictors for New Observations New Obs 1 Humidity 60.0