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Contaminated water: In a sample of 42 water specimens taken from a construction site, 26 contained detectable levels. of lead . Construct 90% confidence interval

Contaminated water:In a sample of 42 water specimens taken from a construction site, 26 contained detectable levels. of lead.

Construct 90% confidence interval for the proportion of water specimens that contain detectable levels of lead.
Construct 95% confidence interval for the proportion of water specimens that contain detectable levels of lead.
What is the effect of increasing the level of confidence on the width of the interval?

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