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Five students take an IQ test. According to the test, their IQ scores are 120, 108, 135, 98 and 110. What is the sum of squares of the deviations of their IQ scores
A small company has 20 employees. Six of these employees will be selected randomly to be interviewed as part of an employee satisfaction program.
An airline wishes to estimate the weight of the paint on a fully painted aircraft of the type it flies. In a sample of four repaintings the average weight.
what is a numerial value that characterize some aspect of a population?a. estimatorb. parameterc. statisticd.
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
If she feels certain that the percentage is somewhere between 20% and 40%, how many persons should be included in the sample?
let x1 and x2 be two independent random variables each representing the number of heads in two flips of a fair coin.
Describe the interrupted time series and the control series designs. What are the strengths of the control series design as compared with the interrupted time series design?
your local newspaper contains a large number of advertisements for unfurnished one-bedroom apartments. you choose 10 at
What is the probability that a new cup will overflow when filled by the automatic dispenser? At what value should the mean amount dispensed by the machine be set to satisfy this wish?
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
A random sample of 375 residents is obtained, and 127 indicate they are satisfied with the local government. Do you think this politician will enter the race for mayor? Justify your answer.
Years to Complete a Graduate Program: The average number of years a person takes to complete a graduate degree program is 3. The standard deviation is 4 months. Assume the variable is normally distributed. If an individual enrolls in the program, ..
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