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A company's manufacturing process uses 500 gallons of water at a time. A "scrubbing" machine then removes most of a chemical pollutant before pumping the water into a nearby lake. To meet federal gregulations the treated water must not contain more than 80 parts per million (ppm) of the chemical. The machine's output can be described by a normal model with standard deviation 4.2 ppm. The company's lawyers insist that no more than 2% of the treated water be over the limit. To achieve this, to what mean should the company se the scrubbing machine.
a. 80 ppm
b. 69.459 ppm
c. 88.626 ppm
d. 75 ppm
e. 71.374 ppm
Once R is selected, the sum is compounded instantaneously for a year so that X= 50000 e^R dollars is the amount at the end of that year. Find the distribution function and the p.d.f. of X.
u.s. bureau of the census data reveal the largest town in the state of oh has a population of one million families. the
Compute the value of the sample correlation coefficient between weekly sales and shelf space. Is the correlation between weekly sales and shelf space significant at the .01 level of significance? What is the estimated regression equation?
The Appliance Center sells a variety of electronics equipments and home appliances. For last four years the following quarterly sales (in $ millions) were recorded.
The evidence supports the manufactuer claim at the .05 significance level. Suppose 49 bulbs were tested with the folowing results: x-bar = 827.5 hours, s= 70 hours. Conduct the test using alpha=.05.
Population have at least some college education. choose 10 persons at random. Find the probability that at least 5 do not have any college education.
Suppose we select a sample of 16 cuts from various CDs sold by CRA CDs, Inc. What can we say about the shape of the distribution of the sample mean?
What is the margin of error of the large-sample 95% confidence interval for the proportion of all Quebec adults who would allow doctor assisted suicide?
compare the mean for the heights of males and the mean for the heights of females in these data. compare the values and
A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparis..
Find out the upper and lower bounds on average life expectancy of the Canadian women such that at least 90% of all population is included.
Calories in each hamburger measured. Can the reporter conclude, at α = 0.05, that the hamburgers from the two chains have a different number of Calories?
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