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Category > Statistics Posted 04 May 2017 My Price 8.00

A local environmental agency has selected

9.72  A local environmental agency has selected a simple random sample of 16 homes to be tested for  tap-water lead. Concentrations  of lead  were  found  to have  a mean of 12 parts per billion and a standard deviation of 4 parts per billion. Considering that the homes were selected  from a community in which there are 100 homes, construct and interpret the 95% confidence interval for the population mean. Based on your results, comment on the possibil-

ity that the average lead concentration in this   commu- nity’s homes might exceed the Environmental Protection Agency’s  recommended limit of 15 parts per billion of   lead.

9.73  A simple random sample is to be drawn from a population of 800. In order to have 95% confidence that the sampling error in estimating 7T is no more than 0.03, what sample size will be necessary?

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Status NEW Posted 04 May 2017 04:05 PM My Price 8.00

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file 1493915666-Answer.docx preview (186 words )
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