The Following MINITAB Output Presents a 95% Confidence Interval for the Mean

question 49

Multiple Choice

The following MINITAB output presents a 95% confidence interval for the mean ozone level on days when the relative humidity is 40%, and a 95% prediction interval for the ozone level on a Particular day when the relative humidity is 40%. The units of ozone are parts per billion. Predicted Values for New Observations

$\begin{array} { l r c c c } \text { New Obs } & \text { Fit } & \text { SE Fit } & 95.0 \% \text { CI } & 95.0 \% \text { PI } \\ 1 & 44.17 & 1.5 & ( 41.23,47.11 ) & ( 28.00,60.34 ) \end{array}$

Values of Predictors for New Observations


What is the $95 \%$ confidence interval for the mean ozone level for days when the relative humidity is $40 \%$ ?

• A) (41.23, 47.11)
• B) (28.00, 60.34)
• C) (40, 95)
• D) (1.5, 44.17)

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