A decision maker is interested in estimating the mean of a population based on a random sample. She wants the confidence level to be 90% and the margin of error to be ± 0.30. She does not know what the population standard deviation is, so she has selected the following pilot sample:

Based on this pilot sample, how many more items must be sampled so that the decision maker can make the desired confidence interval estimate?

Transcribed Image Text:

8.80 4.89 10.98 15.1 14.79 16.93 .27 9.06 4.38 5.65 7.24 3.24 2.6 6.09 6.91