1. In a random sample of 15 CD players brought in form repair, the average repair cost was $80 and the sample standard deviation was $14. Construct a 90% confidence interval for. Assume the repair...

1. In a random sample of 15 CD players brought in form repair, the average repair cost was $80 and the sample standard deviation was $14. Construct a 90% confidence interval for. Assume the repair costs are normally distributed and there are no outliers.