A study was conducted to determine the effect of cigarette smoking on the carbonmonoxide diffusing capacity of the lungs. The carbon monoxide diffusing capacifies for arandom sample of 20 current smokers are listed below.10676109121989385939874958973766210485108Note: Round off the standard deviation to two decimal places.79103a) Construct a 90% confidence interval forthe mean carbon monoxide diffusingcapacity of current smokers. Interpret theresult.b) Based on the interval in (a), would youagree that the mean diffusing capacitycould be 95? Explain.

(a) Obtain the 90% confidence interval for the mean carbon monoxide diffusing capacity of current…

Answered: S A study was conducted to determine…

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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A random sample of 18 venture-capital investments in the fiber optics business sector yielded the following data below, in millions of dollars. Determine and interpret a 95% confidence interval for the mean amount, μ, of all venture-capital investments in the fiber optics business sector. Assume that the population standard deviation is $2.04 million.5.60 6.27 5.96 10.51 2.04 5.485.74 5.58 4.13 8.63 5.95 6.674.21 7.71 9.21 4.98 8.64 6.67
A company manufactures steel shafts for use in engines. Assume that the length of the steelshaft is normally distributed. A random sample of 10 shafts produced in the followingmeasurements of their lengths (in centimetres): 20.5 19.8 21.2 20.2 18.9 19.6 20.7 20.1 19.8 19.0(a) Suppose first that the population standard deviation of the length of the shaft is known. Inaddition, based on this population standard deviation, the margin of error at a confidencelevel of 95% for the mean length of the shaft for the sample of size 25 is 0.50. Find andinterpret an estimate for the mean length of the shaft based on the above sample of size 10with 99% confidence.3(b) Assume now that the population standard deviation of the length of the shaft is unknown.Based on the above sample of size 10, the margin of error for the mean length of the shaftis 0.51564. Find the critical value and significance level associated with this margin oferror. In addition, find and interpret the corresponding confidence…
A selected sample of ?n water specimens and estimate the mean daily rate of pollution produced by a mining operation. If the EPA wants a 99% confidence interval with a margin of error of 0.8 milligram per liter (mg/L), how many water specimens are required in the sample? Assume prior knowledge indicates that pollution readings in water samples taken during a day have been approximately normally distributed with a standard deviation of 4.5 (mg/L).
A sample of eight repair records for a certain fiberoptic component was drawn, and the cost of each repair, in dollars, was recorded. The results were 30 35 19 23 27 22 26 16 Assume the population of repair records is normal. Find a 95% confidence interval for the population standard deviation.
An article in the Journal of Composite Materials (December 1989, Vol. 23, p. 1200) describes the effect of delamination on the natural frequency of beams made from composite laminates. Five such delaminated beams were subjected to loads, and the resulting frequencies (in hertz) were as follows: 230.66 233.05 232.58 229.48 232.58 Calculate a 99% two-sided confidence interval on mean natural frequency.
In a survey conducted in a neighborhood , in which 26 residents were interviewedof this region on the outskirts of Texas, it was found that the monthly per capita incomeaverage is $668.53. Considering that the monthly per capita income follows a Normal distribution with a standard deviation equal to 90.52 dollars, check the corresponding alternativeto the confidence interval for the average monthly per capita income of these people with 99%reliable. (a) [622.729, 714.331](b) [659.548, 677.512](c) [658.826, 678.234](d) [664.182, 672.878](e) [619.047, 718.013]
In monitoring lead in the air after an explosion at a battery factory, it is found that the amount of lead (in ug/m3) over a 6 day period had a standard error of 2.57. Find the margin of error that corresponds to a 95% confidence interval.
In a study of maternal cigarette smoking and bone density in newborns, 77 infants of mothers who smoked had a mean bone mineral content of 0.098 g/cm3 (s1 = 0.026 g/cm3). The 161 infants whose mothers did not smoke had a mean bone mineral content of 0.095 g/cm3 (s2 = 0.025 g/cm3). Calculate the 95% confidence interval for µ1 - µ2
A random sample of 240 adults over the age of 40 found that 144 would use an online dating service. Another random sample of 234 adults age 40 and under showed that 131 would use an online dating service. Assuming all conditions are met, which of the following is the standard error for a 90 percent confidence interval to estimate the difference between the population proportions of adults within each age group who would use an online dating service? 144240(1−144240)240+131234(1−131234)234−−−−−−−−−−−−−−−−−−√144240(1−144240)240+131234(1−131234)234 A 1.65144240(1−144240)240+131234(1−131234)234−−−−−−−−−−−−−−−−−−√1.65144240(1−144240)240+131234(1−131234)234 B 1.96144240(1−144240)240+131234(1−131234)234−−−−−−−−−−−−−−−−−−√1.96144240(1−144240)240+131234(1−131234)234 C 275474(1−275474)474−−−−−−−−√275474(1−275474)474 D 1.65275474(1−275474)474−−−−−−−−√1.65275474(1−275474)474 E
The number of unhealthy days based on the AQI (Air Quality Index) for a random sample of metropolitan areas is shown. The standard deviation of the data set below is 26.26 61 12 6 40 27 38 93 5 13 40 Compute for the lower confidence limit (LCL) of the 98% confidence interval.
A random sample of 8 recent college graduates found that starting salaries for architects in New York City had a mean of $42,653 and a standard deviation of $9,114. Construct a 95% confidence interval for the average starting salary of all architects in the city. a) (34506.12, 50799.88) b) (35222.41, 50083.59) c) (35034, 50272) d) (36337.32, 48968.68)
In monitoring lead in the air after the explosion at the battery factory, it is found that the amounts of lead over a 8 day period had a standard error of 1.88. Find the margin of error that corresponds to a 95% confidence interval. (Round to 2 decimal places)

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