A company has developed a new light bulb that seems to burn longer than most residential bulbs. To determine how long these bulbs burn, the company randomly selects a sample of these bulbs and burns them in the laboratory. The Excel output shown here is a portion of the analysis from this effort. Discuss the output.

Bulb Burn

Mean2198.217Standard deviation152.9907Count84Confidence level (90.0%)27.76691

Appendix A Statistical Tables

(Round the answers to 3 decimal places.)

The 90% confidence interval:

enter an appropriate value rounded to 3 decimal places

enter an appropriate value rounded to 3 decimal places