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

question 32

Multiple Choice

The following MINITAB output presents a 95% confidence interval for the mean ozone level on days when the relative humidity is 55%, and a 95% prediction interval for the ozone level on a Particular day when the relative humidity is 55%. The units of ozone are parts per billion. Predicted Values for New Observations

$\begin{array} { l r c c c } \text { New Obs } & \text { Fit } & \text { SE Fit } & 95.0 \% \text { CI } & 95.0 \% \text { PI } \\ 1 & 38.46 & 1.4 & ( 35.72,41.20 ) & ( 22.17,54.75 ) \end{array}$



What is the point estimate for the mean ozone level for days when the relative humidity is $55 \%$ ?

• A) 55.0
• B) 1.4
• C) 38.46
• D) 35.72

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