Use the Following Information for Questions:
for a Random $\pm$

Multiple Choice

Use the following information for questions:
For a random sample of n = 203 adults in a survey, here is a summary of responses to "How long did you sleep last night?"
-Which of the following provides an approximate 95% confidence interval for the mean hours of sleep the previous night in the population represented by the sample?

A) 6.42 $\pm$ 2×0.11
B) 6.42 $\pm$ 2× $\frac{0.11}{\sqrt{203}}$
C) 6.42 $\pm$ 0.11
D) 6.42 $\pm$ 2×1.56