This paper concentrates on the primary theme of THE STANDARD DEVIATION OF THE LIFE FOR A PARTICULAR BRAND OF ULTRAVIOLET TUBE IS KNOWN TO… in which you have to explain and evaluate its intricate aspects in detail. In addition to this, this paper has been reviewed and purchased by most of the students hence; it has been rated 4.8 points on the scale of 5 points. Besides, the price of this paper starts from £ 40. For more details and full access to the paper, please refer to the site.
The standard deviation of the life for a particular brand of ultraviolet tube is known to be500hr, and the operating life of the tubes is normally distributed. The manufacturer claimsthat average tube life is at least 9000 hr.Test this claim at the 5 percent level of significance against the alternative hypothesis that themean life is less than 9000 hr, and given that fora sample of15 tubes the mean operating lifewas8800hr