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A researcher, concerned about the foreign ownership of the retail trade industy in the U.S., conducts a survey of retail firms in the country. in a sample of one hundred retail firms the researcher
A manufacturer of disk controllers subjects each new controllers to rigorous testing. Of newly assembled controllers, 84% pass the test with no rework. Controller that fail the initial test are rewo
A researcher conducts an experiment on the IQ of one hundred randomly selected only children and finds that their average IQ is 145. test the hypothesis that the IQ of only children is below 150 at
A guard works betwwen 5 p.m. and 12 midnight; he sleeps an average of 1 hour before 9 p.m., and 1.5 hours betwween 9 and 12. An inspector finds him asleep, what is the probability that this happens
Computer and plot Residuals from the linear relationships fit in b) Discuss what they suggest about the appropriateness of that fitted equation. (Plot residuals versus X, residuals versus Y, and mak
The following table displays the salaries of 20 workers per week:
Your program is destroyed when a printer jams. What is the probabilty that printer is involved? Printer B is involved? Printer C is involved?
Often the experimental factor X is replaced by ln(X) in these quantal assay experiments. Repeat (a) using ln(X) and comment on the fit of these models.
Consider babies born in the "normal range" of 37-43 weeks gestational age. Extensive data supports the assumption that for such babies born in the United States, birth weight is normally distributed
The reasearcher for this study calcualted a pearson correlation coefficient and concluded no relationships existed between the two variables. Was he correct in his conclusion?
What is the incidence rate of waterborne diseases in Africa? A patient suffering from a waterborne disease is randomly chosen from a clinic in an African village. What is the probability that this pa
A screening test which measures the level of a prostate speific antigen (PSA) is a commonly used tool for the detection of prostate cancer. Men with PSA levels greater than 10 have a chance of 67% o
In order to calculate the heat loss through the wall of a building, it is necessary to know the temperature difference between the inside and outside walls.
The probability density function of the net weight in ounces of a packaged compound is f(x) =x/40 for 19<x<21 ounces and f(x) =0 for x elsewhere. Show calculations for all parts.
In a binomial experiment the probability of success is 0.06. What is the probability of at most two successes in seven trials?
There are 10 tickets in the box, 3 of them are winning. Find the probability that the first taken ticket is winning ticket and the second taken ticket is winning as well. Taken ticket is not returne
A recent report indicated an average family of four (2 parents and 2 children under the age of 16), spends $500 per month on gasoline. Assume the distribution of gasoline consumption expenditures fo
Consider a case where demand follows a repeating pattern of medium-low-medium-high-medium-low-medium-high-etc, where the difference between low and med is 5 units, and the difference between med and
Compute the mean, variance, and squared coefficient of variation of X. Are X and Y independent? Compute the conditional expectations E[X|Y = 1] and E[X|Y > 1].
A consumer watchdog organization is concerned about credit card debt. A survey of 10 young adults with credit card debt of more than $2,000 showed they paid an average of just over $100 per month ag
Assume X is normally distributed with a mean of 10 and a standard deviation of 2. Determine the following:
In a sample of discharge of suspended solids from a phosphate mine, it was noted that the mean daily discharge was 27 mg/L and variance was 196.
What is the probability of obtaining 2 heads out of 5 tosses of a coin in a binomial distribution?
A student earned a score of 940 on a national achievement test. The mean test score was 850 with a standard deviation of 100. What proportion of students had a higher score than the student with the
A company's construction time follows a normal distribution. The mean time to construct a building is 100 days and the standard deviation is 20 days. The construction team will receive a penalty if