Question

You collect a random sample of size n from a population and calculate a 98% confidence interval. Which of the following strategies produces a new confidence interval with a decreased margin of error?

A.) Use a 99% Confidence level

B.)Use a 95% confidence level

C.)Decrease Sample Size

D.)Use the same confidence level but compute the interval n time. Approximately 2% of these intervals will be larger.

E.)Nothing can guarantee that you will obtain a larger margin of error. You can only say the chance of obtaining a larger interval is 0.02

Answer 1

since decreasing confidence interval require low critical value and provide smaller Confidence interval

option B is correct

B.)Use a 95% confidence level