Can anyone tell me how to use TI-84 calculator to solve this problem???
A company has developed a new type of light bulb, and wants to estimate its mean lifetime. A simple random sample of 12 bulbs had a sample mean lifetime of 692 hours with a sample standard deviation of 30 hours. It is reasonable to believe that the population is approximately normal. Find the lower bound of the 95% confidence interval for the population mean lifetime of all bulbs manufactured by this new process.
Round to the nearest integer. Write only a number as your answer. Do not write any units.
1 answer
692-1.96*30/sqrt(12))
2 answers