Question

If we have a 90% confidence interval for a population parameter, then A. 10% of the time, the population parameter will lie outside of the interval. B. 10% of the time, the population parameter will be lower than the LCL. C. 10% of the time, the population parameter will be higher than the UCL. D. All of the above will hold.

Answer 1

Answer: A. 10% of the time, the population parameter will lie outside of the interval.

Explanation:

If we have
`b\%` confidence interval is that we are
`b\%` certain that it contains the true population parameter in it.

Similarly , if we have a 90% confidence interval for a population parameter, then we are 90% certain that it contains the true population parameter in it.

i.e. 10% not certain that it contains the true population parameter in it.

i.e. 10% of the time, the population parameter will lie outside of the interval.