Unfortunately, arsenic occurs naturally in some ground watert. A mean arsenic level of u- 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 41 tests gave a sample mean of x = 6.9 ppb arsenic, withs- 2.7 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use a = 0.01.
Unfortunately, arsenic occurs naturally in some ground watert. A mean arsenic level of u- 8.0 parts per billion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 41 tests gave a sample mean of x = 6.9 ppb arsenic, withs- 2.7 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use a = 0.01.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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