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The mean income of a group of sample observations is $500; the standard deviation is $40. According to Chebyshev's theorem, at least what percent of the incomes will lie between $400 and $600?
What is the idea of "least squares"? What is the connection between "least squares" and linear regression?
What is the probability of finding 1 or more children with chronic bronchitis in a population where the incidence rate of chronic bronchitis is 10% (like the one above?)
Regression and Correlation are two of the most often used and abused tools in research. People are quick to jump to conclusions that if a relationship exists between two variables, then one must cause (causation) the other. There are many reasons ..
Determine whether the difference in proportions is significant at the 0.05 level.
A manufacturer of a chemical used in glue, attempting to control the amount of a hazardous chemical its workers are exposed to, has given instructions to halt production if the mean amount in the air exceeds 3.0 ppm.
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches.
At α = 0.10, can the researcher conclude that alcohol consumption is related to sex? What kind of Chi-Square test is this?
A motor transport company has 50 similar buses. The management suspects that its control of these vehicles is inadequate. What suggestions could you make for investigating vehicle use, and tightening managerial control over the company?
Increasing the confidence-interval level from .95 to .99
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
The dealership would now like some general information based on the entire sample of vehicles. Calculate and explain the following:
The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. The distribution of mean response times to fire calls follows a normal distribution with a mean of 12.8 minutes and a standard deviat..
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