What are you drinking? Environmental Protection Agency standards require that the amount of lead in drinking water be less than 15 micrograms per liter. Ten samples of water from a particular source have the following concentrations, in units of micrograms per liter: 11.6 14.4 11.7 14.6 15.7 9.0 12.7 8.7 12.1 17.9 Send data to Excel (a) Explain why it is necessary to check that the population is approximately normal before performing a hypothesis test. (b) Following is a dotplot of the data. Is it reasonable to assume that the population is approximately normal? ... .. 10 12 14 16 18 20
What are you drinking? Environmental Protection Agency standards require that the amount of lead in drinking water be less than 15 micrograms per liter. Ten samples of water from a particular source have the following concentrations, in units of micrograms per liter: 11.6 14.4 11.7 14.6 15.7 9.0 12.7 8.7 12.1 17.9 Send data to Excel (a) Explain why it is necessary to check that the population is approximately normal before performing a hypothesis test. (b) Following is a dotplot of the data. Is it reasonable to assume that the population is approximately normal? ... .. 10 12 14 16 18 20
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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Transcribed Image Text:What are you drinking? Environmental Protection Agency standards require that the amount of lead in drinking water be less than 15 micrograms per liter.
Ten samples of water from a particular source have the following concentrations, in units of micrograms per liter:
11.6
14.4
11.7
14.6
15.7
9.0
12.7
8.7
12.1
17.9
Send data to Excel
(a) Explain why it is necessary to check that the population is approximately normal before performing a hypothesis test.
(b) Following is a dotplot of the data. Is it reasonable to assume that the population is approximately normal?
10 12 14 16 18
20
(c) Assume that the population standard deviation is o = 3. If appropriate, perform a hypothesis test at the a = 0.10 level using the critical value method with
the table to determine whether you can conclude that the mean concentration of lead meets the EPA standard. What do you conclude?
Part: 0/ 7
Part 1 of 7
(a) Explain why it is necessary to check that the population is approximately normal before performing a hypothesis test.
It is necessary to check that the population is approximately normal because (Choose one)
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