Solution: When 37 football helmets were subjected to an impact test, 25 sustained unacceptable damage. Form a 90% confidence interval to estimate the population
Question: When 37 football helmets were subjected to an impact test, 25 sustained unacceptable damage.
- Form a 90% confidence interval to estimate the population proportion.
- Give an interpretation of this interval.
- What sample size would be needed to carry out a second test, forming a 97% interval with a margin of error of 4%? (use the information from the previous sample)
Deliverable: Word Document 
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