A random sample of 20 subjects was asked to perform a giventask. The time in seconds it took each of them to complete the taskis recorded below:
49, 26, 46, 40, 37, 39, 33, 47, 31, 35, 39, 43, 28, 38, 41, 29,38, 34, 45, 41 |
If we assume that the completion times are normally distributed,find a 95% confidence interval for the true mean completion timefor this task. Then complete the table below.
Carry your intermediate computations to at least three decimalplaces. Round your answers to one decimal place.
What is the lower limit of the confidence interval?
What is the upper limit of the confidence interval?
