Finding a confidence interval and a prediction interval for the response

Procedure

  1. Select Stat >> Regression >> Regression ...
  2. Specify the response and the predictor(s).
  3. Select Options... In the box labeled Prediction intervals for new observations, specify either the x value or a column name containing multiple x values. Specify the Confidence level — the default is 95%. Select OK.
  4. Select OK. The output will appear in the session window.

Example

For people of the same age and gender, height is often considered a good predictor of weight. The data set htwtmales.txt contains the heights (ht, in cm) and weights (wt, in kg) of a sample of 14 males between the ages of 19 and 26 years.

  1. Find a 95% prediction interval for the weight of a randomly selected male, aged 19 to 26, who is 170 centimeters tall.
  2. Find a 95% confidence interval for the average weight of all males, aged 19 to 26, who are 170 centimeters tall.

Minitab dialog boxes

Resulting Sample Minitab Output

minitab output

Close this window when finished.

© 2004 The Pennsylvania State University. All rights reserved.
Materials developed by Dr. Laura J. Simon (Lecturer, Penn State Department of Statistics).