Maher Saddles, Inc., produces bicycle seats. Among the many seats produced is one for the high-end mountain bicycle market. Maher’s operation manager has recently made a change in the production process for this high-end seat and is scheduled to report on measures associated with the new process at the next staff meeting. After waiting for the process to become stable, he took a random sample of 25 assembly times and found a standard deviation of 47 seconds. He recognizes this is only a point estimate of the variation in completion times and so wants to report both a 90%

and a 95% confidence interval estimate for the population variance.