Question
In: Statistics and Probability
In a certain country, pesticide T is used for controlling insects that are harmful to crops....
In a certain country, pesticide T is used for controlling insects that are harmful to crops. According to standards set by government, drinking water wells with level of pesticide T above 1 part per billion are considered contaminated. A study has been conducted by the Environmental Protection Department (EPD) which has selected a random sample of 250 wells and tested them, and it is found that 50 wells are contaminated
- Construct a 90% confidence interval for the true proportion of wells contaminated with pesticide T in the country. State the condition(s) required for this confidence interval to be valid?
- How large a sample is required if the EPD wants to be 95% confident that the estimation error is within ±0.01?
Solutions
orchestra answered 1 year agoRelated Solutions
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put up boards covered with a sticky material and examine the
insects trapped on the boards. Which colors attract insects best?
Experimenters placed six boards of each of four colors at random
locations in a field of oats and measured the number of cereal leaf
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put up boards covered with a sticky material and examine the
insects trapped on the boards. Which colors attract insects best?
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locations in a field of oats and measured the number of cereal leaf
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put up boards covered with a sticky material and examine the
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