One of the measurements used to determine the health of a person's lungs is the amount of air aperson can exhale under force in one second. This is called forced expiratory volume in onesecond, and is abbreviated FEV,. Assume the mean FEV, for 10-year-old boys is 2.1 litersthat the population standard deviation is o =0.2. A random sample of 53 10-year-old boyslive in a community with high levels of ozone pollution are found to have a sample meanFEV, of 2.09 liters. Can you conclude that the mean FEV, in the high-pollution communitydiffers from 2.1 liters?(A) Yes(B) No

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Answered: One of the measurements used to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The mean number of close friends for the population freshman college students in the U.S.A. is u 5.7. The standard deviation of scores in this population is 1.3. A psychologist predicts that the mean number of close friends for freshman introverts will be significantly different from the mean of the population. The mean number of close friends for a random sample of 25 freshman introverts is M = 6.5. Set your alpha level at a = .05. Complete steps 3 and 4 of the hypothesis testing procedure. What decision should the researcher make regarding the effect of introversion on the number of close friends? = O The researcher should retain Ho and conclude that introversion has no effect on the number of close friends. The researcher should retain HA and conclude that introversion has no effect on the number of close friends. O The researcher should reject Ho and conclude that introversion makes a difference in the number of close friends one has. O The researcher should reject HA and conclude…
The average weight loss at a clinic is 10lbs with a standard deviation of 5lbs. What is the chance that a sample of 100 customers will lose more than 11 lbs on average?
It takes an average of 12.8 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 51 injured patients to immediately tell the truth about the injury and noticed that they averaged 14.1 minutes for their blood to begin clotting after their injury. Their standard deviation was 4.48 minutes. What can be concluded at the the a = 0.01 level significance? a. For this study, we should use [t-test for a population mean b. The null and alternative hypotheses would be: Но: 12.8 H1 : 12.8 c. The test statistic V =| 2.072 (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 [? f. Based on this, we should Select an answer g. Thus, the final conclusion is that ... a the null hypothesis. O The data suggest the populaton mean is significantly different from 12.8 at a = 0.01, so there is…
To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a safety engineer conducts braking tests for 35 models of Make A and 35 models of Make B. The mean braking distance for Make A is 41 feet. Assume the population standard deviation is 4.6 feet. The mean braking distance for Make B is 43 feet. Assume the population standard deviation is 4.4 feet. At a = 0.10, can the engineer support the claim that the mean braking distances are different for the two makes of automobiles? Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e). Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. (a) Identify the claim and state H, and Ha. What is the claim? A. The mean braking distance is greater for Make A automobiles than Make B automobiles. B. The mean braking distance is different for the two makes of…
A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a preliminary study, he guesses that the standard deviation of the population of weight losses is about 10 pounds. How large a sample should he take to estimate the mean weight loss to within 2 pounds, with 90% confidence?
Naini, Cobourne, McDonald and Donaldson (2008) reported that a specific ratio of height to face length of 1 to 8.5 tended to be rated as most attractive—almost exactly what Da Vinci’s idealized Vitruvian Man, predicts as “perfection” in the human form. For this study, we want to see if there is a relationship between a person’s height and head circumference. We get a random sample of 40 people and measure both their height and their head size to the nearest centimeter. What test should you use and why?
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…
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The EPA recommends avoiding consumption of fish species if the mercury concentration is higher than 0.45 (ug mercury/g uncooked fish). The concentration in a large random sample of marlin was found to be 0.42 ug/g with a margin of error = 0.06 ug/g. Explain whether the EPA should consider marlin a species to avoid for consumption.
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 =…
Unfortunately, arsenic occurs naturally in some ground water.† A mean arsenic level of μ = 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 31 tests gave a sample mean of x = 6.9 ppb arsenic, with s = 2.4 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use ? = 0.01. (a) What is the level of significance? What is the value of the sample test statistic? (Round your answer to three decimal places.)

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