The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on averagethe reduction in systolic blood pressure is 37 for a sample of size 25 and standard deviation 8.Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidenclevel).Give your answers to one decimal place and provide the point estimate with its margin of error.±

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Answered: The effectiveness of a blood-pressure…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section: Chapter Questions

Problem 22SGR

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Similar questions

Find the mean hourly cost when the cell phone described above is used for 240 minutes.
The systolic blood pressure (in millimeters) of males has an approximately normal distribution with mean l=125 and standard deviation o= 14. Find the 80th percentile of the distribution of systolic blood pressures. Round to the nearest whole.
The distribution of blood cholesterol level in the population of young men aged 20 to 34 years is close to Normal with standard deviation ? = 45 milligrams per deciliter (mg/dL). You measure the blood cholesterol of 13 cross-country runners. The mean level is x = 174 mg/dL. Assume that ? is the same as in the general population. How large a sample is needed to cut the margin-of-error in half for a 90% confidence interval of the mean level ? among the cross-country runners?
Find the proportion of Normally distributed observations with a zz-score above 0.84. Give your answer to four decimal places.
For a medical study, a researcher wishes to select people in the middle 60% of the population based on blood pressure. Assuming that blood pressure readings are normally distributed and the mean systolic blood pressure is 120 and the standard deviation is 8, find the upper and lower readings that would qualify people to participate in the study. Draw a normal curve then shade the needed area and indicate the z-value (or z-score).
The cholesterol levels of an adult can be described by a normal model with a mean of 188mg/dL and a standard deviation of 28. What percent of adults do you expect to have cholesterol levels over 200mg/dL? What percent of adults do you expect to have cholesterol levels between 150 and160mg/dL? Estimate the interquartile range of cholesterol levels.
The birth weights of children born in the United States are normally distributed and have a ?=7.5μ=7.5 pounds. How does the median birth weight compare to the average birth weight?
It takes an average of 8 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 8.5 minutes for their blood to begin clotting after their injury. Their standard deviation was 1.3 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: Ho: ? 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 v the null hypothesis. g. Thus, the final conclusion is that .. O The data suggest the populaton mean is significantly greater than 8 at a = 0.10, so…
The average age of senators in the 108th Congress was 60.5 years. If the standard deviation was 13.5 years, find the z-scores corresponding to the oldest and youngest senators of age 82 and 40. Round z scores to two decimal places.
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 =…
Karen scored a 76 on an exam whose mean is 74 and whose standard deviation is 8. Find her z score.
It takes an average of 14.5 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 50 injured patients to immediately tell the truth about the injury and noticed that they averaged 14.3 minutes for their blood to begin clotting after their injury. Their standard deviation was 2.95 minutes. What can be concluded at the the a = 0.01 level of significance? a. For this study, we should use b. The null and alternative hypotheses would be: Select an answer Но: ? Select an answer H1: Select an answer ? 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 ? f. Based on this, we should Select an answer 0 the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the population mean is not significantly different from 14.5 at a = 0.01, so there…

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