Ten randomly selected people were asked how long they slept at night. The mean time was 7.1 hours, and the standard deviation was 0.78 hour. Assume that the data is normally distributed.
a. For a 95% confidence level, find the margin of error. Round to two decimal places.
a. Construct a 95% confidence interval of the mean time. Interpret your results.
Answer:
a. E = 0.56
b. 6.54 hours < m < 7.66 hours