STAT.F/BUS.+ECO.PKG.:LOOSELEAF+MYLABSPL
13th Edition
ISBN: 9780135412428
Author: MCCLAVE
Publisher: PEARSON C
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Chapter 6.3, Problem 6.35ACI
Oxygen bubbles in molten salt. Molten salt is used in an electro-refiner to treat nuclear fuel waste. Eventually, the salt needs to be purified (for reuse) or disposed of. A promising method of purification involves oxidation. Such a method was investigated in Chemical Engineering Research and Design (March. 2013). An important aspect of the purification process is the rising velocity of oxygen bubbles in the molten salt. An experiment was conducted in which oxygen was inserted (at a designated sparging rate) into molten salt and photographic images of the bubbles were taken. A random sample of 25 images yielded the data on bubble velocity (measured in meters per second) shown in the table. (Note: These data are simulated based on information provided in the article)
| 0.275 | 0.261 | 0.209 | 0.266 | 0.265 | 0.312 | 0.285 | 0.317 | 0.229 |
| 0.251 | 0.256 | 0.339 | 0.213 | 0.178 | 0.217 | 0.307 | 0.264 | 0.319 |
| 0.298 | 0.169 | 0.342 | 0.270 | 0.262 | 0.228 | 0.220 |
- a. Use statistical software to find a 95% confidence interval for the mean bubble rising velocity of the population. Interpret the result. (.243, .281)
- b. The researchers discovered that the mean bubble rising velocity is µ − .338 when the sparging rate of oxygen is 3.33 × 10−6. Do you believe that the data in the table were generated at this sparging rate? Explain. No
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A researcher hypothesizes that in a certain country the net annual growth of private sector purchases of government bonds, B, is positively related to the nominal rate of interest on the bonds, NI, and negatively related to the rate of inflation Π:
Bt = a0 + a1NIt + a2Π t + ut
Note that it may be hypothesized that B depends on the real rate of interest on bonds, R, where R = NI – Π.
Using a sample of 56 annual observations, s/he estimates the following equations:
(1) Bt = 0.43 + 0.90NIt - 0.97Πt R21 = 0.962, SSR1 = 2.20, QRESET(F1,52) = 16.6
(3.58) (8.80) (-1.05)
(2) Bt = 0.44 + 0.94Rt R22 = 0.960, SSR2 = 2.22, QRESET(F1,53) = 0.9
(9.70) (16.7)
(3) Bt = 0.44 + 1.14NIt SSR3 = 9.20, QRESET(F1,53) = 59.9
(8.84) (36.1)
(4) NIt = 0.08 + 0.94Πt R24 = 0.997, SSR4 = 0.18, QRESET(F1,53) = 1.4…
In the order-up-to model, the standard deviation of the order quantities: a. is higher than the standard deviation of demand in one period.b. is lower than the standard deviation of demand in one period.c. is equal to the standard deviation of demand in one period.d. cannot be compared to the standard deviation of demand in one period.
Researchers interested in lead exposure due to car exhaust sampled the blood of 52 police officers subjected to constant inhalation of automobile exhaust fumes while working traffic enforcement in a primarily urban environment. The blood samples of these officers had an average lead concentration of 124.32 µg/l and a SD of 37.74 µg/l; a previous study of individuals from a nearby suburb, with no history of exposure, found an average blood level concentration of 35 µg/l.
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Based on your preceding result, without performing a calculation, would a 99% confidence interval for the average blood concentration level of police officers contain 35 µg/l?
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Chapter 6 Solutions
STAT.F/BUS.+ECO.PKG.:LOOSELEAF+MYLABSPL
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