An AP Statistics teacher asks her class to construct confidence intervals given a sample proportion of .45 and a variety of sample sizes. Four groups of students are each given a different sample size and the intervals from the groups are displayed on the chalkboard. Which of the following intervals must be incorrect? Explain how you made your decision.
Group A: (.37, .53)
Group B: (.41, .49)
Group C: (.35, .55)
Group D: (.40, .49)
All help is appreciated, thanks.