At a .05 level of significance, a researcher decides to reject the null hypothesis that the value of a population mean is equal to 12. Which of the following CIs is consistent with this conclusion?
A. 95% CI of 11 and 13
B. 95% CI of 8 and 12
C. 95% CI of 9 and 11
D. 95% CI of 11.5 and 12.5
Answer: C
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