Camila is curious about the average length of the female blue whales her organization monitors. She takes a random sample of 4 female blue whales from this population. Their average recorded length is ã = 78 m
and their standard deviation is 8, = 10 m. The distribution of lengths in the sample is roughly symmetric
with no obvious outliers.
Based on this sample, which of the following is a 95% confidence interval for the mean length (in meters)
of female blue whales?
23