Suppose you want to calculate a confidence interval to estimate ...

[K@]

Suppose you want to calculate a confidence interval to estimate the population mean. What happens if you want to be more than 95 confident in your results but you can't take another sample? (Assume data quality is not an issue.)
 a. You need a larger confidence level than 95.
  b. You need to use a multiplier that is larger than 2 to create your margin of error.
  c. You will have to live with a wider confidence interval.
  d. All of the above.

Question 2

No matter what type of population value (or combination of population values) is being estimated using a confidence interval, what items should you be watching for, in order to best assess the results?
 a. That the sample(s) selected represent the population(s).
  b. That the confidence level is clearly stated.
  c. That any real differences for which the researchers imply a causal relationship came from a randomized experiment.
  d. All of the above.

[lou]

Answer to Question 1

D

Answer to Question 2

D

[K@]

Excellent

[brbarasa]

TYSM