Assignment:
The manufacturer of batteries used in small electric appliances wants to estimate the average life of a battery. A random sample of 12 batteries yields x = 34.2 hours and s = 5.9 hours. Give a 95% confidence interval for the average life of a battery.
Your answer must be typed, double-spaced, Times New Roman font (size 12), one-inch margins on all sides, APA format and also include references.