Saturday
August 23, 2014

Homework Help: STATISTICS PLESE HELP!!

Posted by Courtney on Monday, November 8, 2010 at 10:37pm.

studies indicate that drinking water supplied by some old lead-lined city piping systems may contain harmful levels of lead. an important study of the Boston water supply system showed that the distribution of lead content readings for individual water specimens had a mean and standard deviation of approximately .033 milligrams per liter (mg/l) and .10mg/l,respectively.
(a)explain why you believe this distribution is or is not normally distributed.
(b) because the researchers were concerned about the shape of the distribution in part a, they calculated the average daily lead levels at 40 different locations on each of 23 randomly selected days. what can you say about the shape of the distribution of the average daily lead levels from which the sample of 23 days was taken?
(c) what are the mean and standard deviation of the distribution of average lead levels in part b?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

statistics - studies indicate that drinking water supplied by some old lead-...
chemistry - Lead pipes were once used to transport drinking water and are still ...
Public Health - All of the following are true of lead as an environmental hazard...
chemisry - What are the specializations of sanitary engineering? Drinking water ...
chemistry - How would a titration be used to determine the concentration of lead...
chemistry - A 375 g sample of well water is found to contain 17.0 mg of lead. ...
chemistry - A 375 g sample of well water is found to contain 17.0 mg of lead. ...
chemistry - The maximum concentration set by the U.S. Environmental Protection ...
Chemistry - A student heats 9.85 g of lead to a temperature of 92.3 C. He ...
Chemisty - A student heats 10.8 g of lead to a temperature of 90.5 C. He places ...

Search
Members