Periodically, the county Water Department tests the drinking water of homeowners for contminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below. lead (?μg/L)copper (mg/L)3.33.30.6280.6283.33.30.2930.2930.30.30.7830.7834.74.70.1950.195550.3780.3781.41.40.2330.2330.90.90.1010.1010.90.90.6980.6983.63.60.80.81.21.20.7610.761(a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment. _____≤μ≤_____(b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment. ______≤μ≤______

(a) The 99% confidence interval for the mean lead level in water specimens of the sub development is…

Answered: Periodically, the county Water…

Mathematics For Machine Technology

8th Edition

ISBN:9781337798310

Author:Peterson, John.

Publisher:Peterson, John.

Chapter29: Tolerance, Clearance, And Interference

Section: Chapter Questions

Problem 16A: Spacers are manufactured to the mean dimension and tolerance shown in Figure 29-12. An inspector...

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Periodically, the county Water Department tests the drinking water of homeowners for contminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopement of the county are shown below.

lead (?μg/L)	copper (mg/L)
3.33.3	0.6280.628
3.33.3	0.2930.293
0.30.3	0.7830.783
4.74.7	0.1950.195
55	0.3780.378
1.41.4	0.2330.233
0.90.9	0.1010.101
0.90.9	0.6980.698
3.63.6	0.80.8
1.21.2	0.7610.761

(a) Construct a 99% confidence interval for the mean lead level in water specimans of the subdevelopment.
_____≤μ≤_____

(b) Construct a 99% confidence interval for the mean copper level in water specimans of the subdevelopment.
______≤μ≤______

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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