Error in Mendenhall & Sincich Text

The answer in the back of the book to Exercise 8.64, pages 403-404, is wrong since it pertains to a 90%, not a 95%, confidence interval. (The exercise itself specifies no particular level of confidence for the interval.)

Download a zipped Excel spreadsheet here for more details.

Credit to Roger Pawlowski for calling my attention to this error.

Date 16 November 1999.