Concept explainers
Forced expiratory volume (FEV) is an index of pulmonary
In comparably aged currently smoking men FEV is normally distributed, with mean = 3.5 L and standard deviation = 0.6 L.
Some people are not functionally impaired now, but their pulmonary function usually declines with age and they eventually will be functionally impaired. Assume that the decline in FEV over n years is normally distributed, with mean = 0.03n L and standard deviation = 0.02n L.
Answer Problem 5.23 for a 25-year-old man with an FEV of 4.0 L.
5.23 What is the
5.21 If an FEV of less than 2.5 L is regarded as showing some functional impairment (occasional breathlessness, inability to climb stairs, etc.), then what is the probability that a currently smoking man has functional impairment?
Trending nowThis is a popular solution!
Chapter 5 Solutions
EBK FUNDAMENTALS OF BIOSTATISTICS
- Find the mean hourly cost when the cell phone described above is used for 240 minutes.arrow_forwardWhat relation exists between the average deviation of the mean?arrow_forwardCerebral blood flow (CBF) in the brains of healthy people is normally distributed with a mean of 74 and a standard deviation of 16. Find the Z score associated with a CBF reading of 78.arrow_forward
- Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma. Over a period of months, an adult male patient has taken eight blood tests for uric acid. The mean concentration was = 3.5 mg/dl. The distribution of uric acid in healthy adult males can be assumed to be normal, with σ = 1.85 mg/dl. Find a 95% confidence interval for the population mean concentration of uric acid in this patient’s blood. What is the margin of error? What conditions are necessary for your calculations? Interpret results in the context of this problem. Sample Size Find the sample size necessary for a 95% confidence level with maximal margin of error E=1.10 for the mean concentration of uric acid in this patient’s blood.arrow_forwardOverproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma. Over a period of months, anadult male patient has taken eight blood tests for uric acid. The mean concentration was ?̅= 5.35mg/dl. The distribution of uric acid in healthy adult males can be assumed to be normal, with σ = 1.85 mg/dl.a. Find a 90% confidence interval for the population mean concentration of uric acid in this patient’s blood. What is the margin of error?b. Find a 99% confidence interval for the population mean concentration of uric acid in this patient’s blood. What is the margin of error? Compare the lengths of the confidence intervals for parts (a) and (b). As the confidence levelsincrease, do the confidence intervals increase in length?arrow_forwardOverproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma.+ Over a period months, an adult male patient has taken five blood tests for uric acid. The mean concentration was x = 5.34 mg/dl. The distribution of uric acid in healthy adult males can be assumed to be normal, with σ = 1.83 mg/dl. (a) Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. What is the margin of error? (Round your answers to two decimal places.) lower limit upper limit margin of error (b) What conditions are necessary for your calculations? (Select all that apply.) Oo is unknown O uniform distribution of uric acid F σ is known O normal distribution of uric acid On is large (c) Interpret your results in the context of this problem. O The probability that this interval contains the true average uric acid level for this patient is 0.05. O The probability that…arrow_forward
- = 222 mg/dLi and Total cholesterol levels for middle aged men (aged 55 – 64) follow approximately a normal distribution with mean, µ standard deviation, o = 37 mg/dLi. Those with a total cholesterol of 240 mg/dLi or higher have "high" cholesterol (and have twice the risk of coronary heart disease as someone with a total cholesterol less than 200 mg/dLi) Find the Z-score (standard score) for an observation of 290 mg/dl.arrow_forwardThe scores of adults on an IQ test are approximately Normal with mean 100 and standard deviation 15. Find the top 10% of the scores (2 decimal points) and IQ score of top 10% (1 decimal point).arrow_forwardA normal population has a mean= 61 and standard deviation=16. what proportion of the population is greater than 100?arrow_forward
- The amount of radiation that a person can absorb and survive varies from person to person. It is known that in the entire population this amount of radiation follows a normal distribution with an expected value of 500 roentgens and a standard deviation of 150 roentgens. What is the radiation level above which only 5 percent of those exposed to it survive?arrow_forwardBone density test scores are normally distributed with a mean of 0 and a standard deviation of 1. Find P99, the 99th percentile. This is the bone density score separating the bottom 99% from the top 1%.arrow_forwardThe distribution for the time a patient of a medical center spends waiting for an appointment is normal with mean of 35 minutes and standard deviation of 12 minutes. What percentage of patients will wait between 20 and 40 minutes for an appointment?arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin HarcourtCollege Algebra (MindTap Course List)AlgebraISBN:9781305652231Author:R. David Gustafson, Jeff HughesPublisher:Cengage Learning
- Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL