In a Sample of 12 Participants,a Researcher Estimates the 80

Multiple Choice

In a sample of 12 participants,a researcher estimates the 80% CI for a sample with a mean of M = 22.3 and an estimated standard error (S_M) of 4.7.What is the confidence interval at this level of confidence?

A) 80% CI 12.1, 32.5
B) 80% CI 17.6, 27.0
C) 80% CI 15.9, 28.7
D) there is not enough information to answer this question