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Levels Tought:
University
| Teaching Since: | Apr 2017 |
| Last Sign in: | 438 Weeks Ago, 1 Day Ago |
| Questions Answered: | 9562 |
| Tutorials Posted: | 9559 |
bachelor in business administration
Polytechnic State University Sanluis
Jan-2006 - Nov-2010
CPA
Polytechnic State University
Jan-2012 - Nov-2016
Professor
Harvard Square Academy (HS2)
Mar-2012 - Present
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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