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Workers exposed to dioxin. The Occupational Safety and Health Administration (OSHA) conducted a study to evaluate the level of exposure of workers to the dioxin TCDD. The distribution of TCDD levels in parts per trillion (ppt) of production workers at a Newark, New Jersey, chemical plant had a mean of 293 ppt and a standard deviation of 847 ppt (Chemosphere, Vol. 20, 1990). A graph of the distribution is shown here. In a random sample of n = 50 workers selected at the New Jersey plant, let y‾ represent the sample mean TCDD level.
(a) Find the mean and standard deviation of the sampling distribution of y‾.
(b) Draw a sketch of the sampling distribution of y‾. Locate the mean on the graph.
(c) Find the probability that y‾ exceeds 550 ppt.
The Law of Increasing Entropy is an impenetrable barrier which no evolutionary mechanism yet suggested has ever been able to overcome. Evolution and entropy are opposing and mutually exclusive concepts. If the entropy principle is really a univers..
State the direction of the alternative hypothesis used to test that the demand function is downward sloping. Type gt (greater than), ge (greater than or equal to), lt (less than), le (less than or equal to) or ne (not equal to) as appropriate in the ..
the following frequency distribution presents a set of exam scores for a class of n 20 students.x f
The manufacturer would like to establish inventory levels such that there is only a five percent chance of running out of stock. Where should the manufacturer set the inventory level?
a manufacturer of industrial solvent guarantees its customers that each drum of solvent they ship out contains at least
Choose a construct you would like to measure. Create an operational definition of your construct using at least three peer-reviewed journal articles as references.
Explain the different types of measurement scales and give examples in the following situations:- Gallons of water to put out a fire by the fire department
The One-Way ANOVA applet lets you see how the F statistic and the P-value depend on the variability of the data within groups and the differences among the means. The black dots are at the means of the three groups. Move these up and down until..
Use the t-distribution table to find the critical value(s) for the indicated alternative hypothesis, level of significance ?, and sample sizes n? and n?.
A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours. A random sample of 50 bulbs burned out with a mean life-span of 2,470 hours and a sample standard deviation of 140 hours.
Prove that the rotated principal components V(r) of Theorem 5.2 no longer successively account for maximum variance.
The average cost of a one bedroom apartment in a town is $550 per month. What is the probability of randomly selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviat..
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