Answer: It is important that face masks used by
Chapter 7, Problem 7.54(choose chapter or problem)
It is important that face masks used by firefighters be able to withstand high temperatures because firefighters commonly work in temperatures of 200500F. In a test of one type of mask, 11 of 55 masks had lenses pop out at 250. Construct a 90% CI for the true proportion of masks of this type whose lenses would pop out at 250
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