# Assume that a simple random sa

**Question description**

Assume that a simple random sample has been taken, the population standard deviation is not known, and the population is normally distributed. Medical researchers studying cochlear implants, devices placed behind the bone in the ear to improve hearing, found the following number of implants over the last twelve years in children under 3 years old. Use a 90% confidence level and the following sample data:40 90 99 120 150 220 300 320 460 520 600 650Find the margin of error E that corresponds to the above statistics and confidence level. Give your answer with one decimal, e.g., 1223.4 .

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