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14) Arsenic is an element that can naturally get into local water supplies. The maximum safe level of arsenic in water is assumed to be 10 parts per billion (ppb). A sample of n=35 homes were sampled for tap water, and the sample mean arsenic level was found to be 9.72 ppm. If the population standard deviation is assumed to be 0.55 ppb, then: (a) write the null and alternate hypotheses to test to see if the mean concentration of arsenic in tap water is less than 10 ppb; b) Carry out a one-sample z-test at the 5% significance level Instead of a z-test, repeat this test using the p-value approach. All you need to do is calculate the p-value. Then state whether you would accept or reject the null hypothesis at the 5% level based on the p-value. No need to re-write everything else.

14) Arsenic is an element that can naturally get into local water supplies. The maximum safe level of arsenic in water is assumed to be 10 parts per billion (ppb). A sample of n=35 homes were sampled for tap water, and the sample mean arsenic level was found to be 9.72 ppm. If the population standard deviation is assumed to be 0.55 ppb, then: (a) write the null and alternate hypotheses to test to see if the mean concentration of arsenic in tap water is less than 10 ppb; b) Carry out a one-sample z-test at the 5% significance level Instead of a z-test, repeat this test using the p-value approach. All you need to do is calculate the p-value. Then state whether you would accept or reject the null hypothesis at the 5% level based on the p-value. No need to re-write everything else.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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10:05 AM Sat Dec 19 * 64% +: 0 14) Arsenic is an element that can naturally get into local water supplies. The maximum safe level of arsenic in water is assumed to be 10 parts per billion (ppb). A sample of n = 35 homes were sampled for tap water, and the sample mean arsenic level was found to be 9.72 ppm. If the population standard deviation is assumed to be 0.55 ppb, then: (a) write the null and alternate hypotheses to test to see if the mean concentration of arsenic in tap water is less than 10 ppb; b) Carry out a one-sample z-test at the 5% significance level Instead of a z-test, repeat this test using the p-value approach. All you need to do is calculate the p-value. Then state whether you would accept or reject the null hypothesis at the 5% level based on the p-value. No need to re-write everything else. 19 T
Transcribed Image Text:10:05 AM Sat Dec 19 * 64% +: 0 14) Arsenic is an element that can naturally get into local water supplies. The maximum safe level of arsenic in water is assumed to be 10 parts per billion (ppb). A sample of n = 35 homes were sampled for tap water, and the sample mean arsenic level was found to be 9.72 ppm. If the population standard deviation is assumed to be 0.55 ppb, then: (a) write the null and alternate hypotheses to test to see if the mean concentration of arsenic in tap water is less than 10 ppb; b) Carry out a one-sample z-test at the 5% significance level Instead of a z-test, repeat this test using the p-value approach. All you need to do is calculate the p-value. Then state whether you would accept or reject the null hypothesis at the 5% level based on the p-value. No need to re-write everything else. 19 T
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