b SPS Programs Sn Uhline Locker: Virtu. E Untitled document -.G kji - Google SearchI SpanishUnfortunately, 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 basts for arsenic. A random sample of 41 tests gave asample mean of x = 7.2 ppb arsenic, with s = 2.0 ppb. Does this information Indicate that the mean level of arsenic in this well is less than 8 ppb? Use a = 0.01.(a) What is the level of significance?State the null and alternate hypotheses.O Ho: H = 8 ppb; H: u > 8 ppbO Ho: H<8 ppb; H: H=8 ppbO Ho: 4 > 8 ppb; H: u = 8 ppbO Hạ: H = 8 ppb; H: u -8 ppbO Hai H = 8 ppb; H: u <8 ppb(b) what sampling distribution will you use? Explain the rationale for your choice of sampling distribution.O The standard normal, since the sample size is large and o is unknown.O The standard normal, since the sample size is large and o is known.O The Student's t, since the sample size is large and o is known.O The Student's t, since the sample size is large and ois unknown.What is the value of the sample test statistic? (Round your answer to three decimal places.)(c) Estimate the P-value.O P-value > 0.250O 0.125 < P-value < 0.250O 0.050 < P-value <0.125O 0.025 < P.value < 0.050O 0.005 < P-value <0,025O P-value < 0.005Sketch the sampling distribution and show the area corresponding to the Pvalue.us O9I 8:29hpesc->C'#3$4backspace%3D8.9.1345.

Name: b SPS Programs Sn Uhline Locker: Virtu. E Untitled document -.G kji -
Uploaded: 2024-03-20T07:07:12.000Z
Channel: Bartleby
Description: b SPS Programs Sn Uhline Locker: Virtu. E Untitled document -.G kji - Google SearchI SpanishUnfortunately, 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) Denote μ as the average arsenic level.

Math

Statistics

Unfortunately, arsenic occurs naturally in some ground watert. A mean arsenic level of u8.0 parts per bilion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basts for arsenic. A random sample of 41 tests gave a sample mean of x=7.2 ppb arsenic, with s= 2.0 ppb. Does this information indicate that the mean level of arsenic in this well is less than pob? Use a0.01. (a) what is the level of significance? State the null and altemate hypotheses. O Hgi H=8 ppb; H H>8 ppb O Moi <8 ppb; H ppb O Hgi 4>8 ppb; HH-8 ppb O Ha: H =8 ppb; H u-8 ppb O Hgi H ppb; H <8 ppb (b) what sampling distribution will you use? Explain the rationale for your cholce of sampling distribution. O The standard normal, since the sample stze is large and ais unknown. O The standard normal, since the sample size is large and os known. O The Student's t, since the sample stze is large and os known, O The Student's t, unce the sample stze is large and os unknown. What is the value of the sample test statistic? (Round your answer to three deamal places) (c) Estimate the Pvalue. OPvalue 0.250 O 0.125

Unfortunately, arsenic occurs naturally in some ground watert. A mean arsenic level of u8.0 parts per bilion (ppb) is considered safe for agricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basts for arsenic. A random sample of 41 tests gave a sample mean of x=7.2 ppb arsenic, with s= 2.0 ppb. Does this information indicate that the mean level of arsenic in this well is less than pob? Use a0.01. (a) what is the level of significance? State the null and altemate hypotheses. O Hgi H=8 ppb; H H>8 ppb O Moi <8 ppb; H ppb O Hgi 4>8 ppb; HH-8 ppb O Ha: H =8 ppb; H u-8 ppb O Hgi H ppb; H <8 ppb (b) what sampling distribution will you use? Explain the rationale for your cholce of sampling distribution. O The standard normal, since the sample stze is large and ais unknown. O The standard normal, since the sample size is large and os known. O The Student's t, since the sample stze is large and os known, O The Student's t, unce the sample stze is large and os unknown. What is the value of the sample test statistic? (Round your answer to three deamal places) (c) Estimate the Pvalue. OPvalue 0.250 O 0.125

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

On a standardized exam, the scores are normally distributed with a mean of 550 and a standard deviation of 40. Find the z-score of a person who scored 538 on the exam.
Suppose a marine scientist is measuring salinity levels of seawater samples from the Atlantic ocean. Suppose the salinity values have a normal distribution with a mean of 35 "parts per mill" and a standard deviation of 2 "parts per mil". About what percentage of salinity measurements will be between 31 and 39 "parts per mill"?
It takes an average of 11.6 minutes for blood to begin clotting after an injury. An EMT wants to see if the average will change if the patient is immediately told the truth about the injury. The EMT randomly selected 40 injured patients to immediately tell the truth about the injury and noticed that they averaged 12.1 minutes for their blood to begin clotting after their injury. Their standard deviation was 1.76 minutes. What can be concluded at the the a = 0.05 level of significance? For this study, we should use Select an answer The null and alternative hypotheses would be: Ho: ? Select an answer H₁: ? Select an answer The test statistic ? ✓ = The p-value = The p-value is ? ✓ a Based on this, we should [Select an answer the null hypothesis. Thus, the final conclusion is that ... (please show your answer to 3 decimal places.) (Please show your answer to 4 decimal places.) O The data suggest the population mean is significantly different from 11.6 at a = 0.05, so there is statistically…
A normal population has the mean m=70 and standard deviation 20. what proportion of the population is greater that 95 by drawing the appropriate graph?
It takes an average of 12.7 minutes for blood to begin clotting after an injury. An EMT wants to see if the average will increase if the patient is immediately told the truth about the injury. The EMT randomly selected 46 injured patients to immediately tell the truth about the injury and noticed that they averaged 13.5 minutes for their blood to begin clotting after their injury. Their standard deviation was 1.77 minutes. What can be concluded at the the a = 0.10 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Но: ? v Select an answer v H1: ? v Select an answer v c. The test statistic ? v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? v a f. Based on this, we should Select an answer g. Thus, the final conclusion is that ... the null hypothesis. O The data suggest that the population mean is not significantly greater than 12.7…
The U.S. Census Bureau computes quarterly vacancy and homeownership rates by state and metropolitan statistical area. Each metropolitan statistical area has at least one urbanized area of 50,000 or more inhabitants. The data in Sheet 10 are the rental vacancy rates (%) for metropolitan statistical area in four geographic regions of the U.S. for the first quarter of 2008. Use alpha = 0.05 to test whether the mean vacancy rate is the same for each geographic region. Sheet 10 Midwest Northeast South West 16,2 2,7 16,6 7,9 10,1 11,5 8,5 6,6 8,6 6,6 12,1 6,9 12,3 7,9 9,8 5,6 10 5,3 9,3 4,3 16,9 10,7 9,1 15,2 16,9 8,6 5,6 5,7 5,4 5,5 9,4 4 18,1 12,7 11,6 12,3 11,9 8,3 15,6 3,6 11 6,7 18,3 11 9,6 14,2 13,4 12,1 7,6 1,7 6,5 8,7 12,9 3,6 11,4 5 12,2 11,5 13,1 4,7 13,6 16,3 4,4 3,3 8,2 3,4 24 5,5 12,2 22,6 12 14,5 12,6 9,5 10,1 Select one: a) Sum of Squares Between Groups = 376.87 >…
It takes an average of 14.6 minutes for blood to begin clotting after an injury. An EMT wants to see if the average will increase if the patient is immediately told the truth about the injury. The EMT randomly selected 60 injured patients to immediately tell the truth about the injury and noticed that they averaged 15.4 minutes for their blood to begin clotting after their injury. Their standard deviation was 2.66 minutes. What can be concluded at the the a = 0.10 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Но: ? Select an answer ♥ H: ? v| Select an answer v c. The test statistic (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? va f. Based on this, we should Select an answer | the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest that the population mean is not significantly greater than 14.6 at a =…
If a sample of 144 male weights has a mean of 266 pounds and standard deviation of 32 pounds. The CV for this sample is?
The level of nitrogen oxides (NOX) in the exhaust of a particular car model varies with mean 0.9 grams per mile and standard deviation 0.16 grams per mile
A population of N = 10 scores has a mean of µ = 6. After one score is removed, the mean is found to be M = 5. What is the value of the score that was removed?
On a standardized exam, the scores are normally distributed with a mean of 350 and a standard deviation of 20. Find the z-score of a person who scored 400 on the exam.
The lengths of metal bolts are normally distributed with mean μ cm and standard deviation 7 cm. If 2.5 % of the bolts measure more than 68 cm, find the value of μ?