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Ten prominent citizens have been nominated for a community's "Citizen of the Year" award. First- and second-place trophies are awarded to the two persons receiving the highest and second-highest number of votes. In how many different ways can the trophies be awarded?
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
lowering the price does not decrease this behavior and we should not decide to lower prices based on this research." Comment on the executive's conclusion. What type of inference is being made? Will the decision not to lower prices be a good one.
Develop the estimated regression equation that can be used to predict the closing price given the value of Period At the .05 level of significance, test for any positive autocorrelation in the date.
Suppose it is known that if you offer free samples o a product, at least 52% of adults are more likely to buy the product. You interview a random sample of 50 adults.
A company that manufactures computer chips wants to use a multiple regression model to study the effect that 4 different variables have on y, the total daily production cost (in thousands of dollars).
Eexperiment begins the instant after the zeroth car goes by. Determine, in as simple form as possible, expressions for the probability that?
Picking numbers at random I pick two numbers uniformly at random from {1; 2; : : : ; 6n}, with replacement. What is the probability that both numbers choose are divisible by 2?
A simple random sample of 100 of a certain popular model car in 2003 found that 20 had a certain minor defect in the brakes. A simple random sample of 400 of this model car in 2004 found that 50 had the minor defect in the brakes.
We are interested in determining if the accident proportions differ between the two age groups:
if you assume returns follow a normal distribution, which investment has a better chance of giving you $40 million in returns.
How large a sample should be selected in order to estimate the population proportion to within a margin of error of 0.02 with 97% confidence. The sample proportion from the preliminary sample was 0.18.
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