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A company ships computer components in boxes that contain 20 iteams. Assume the probability of a defective component is .4. use the geometric distribution to find the probability that the first defect is found in the third or fourth component tested.
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
Can we conclude that the mean age of the population from which the sample may be presumed to have been drawn is less than 60 years? Let α = .05
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
Run a simple regression of the dependent variable demand on the independent variable price and observe the coefficient on price.
Explain the meaning of the conditional mean of the dependent variable in the population regression function. Illustrate using an example.
Choose one of the options below that explains what information is provided in the interval that is not in the significance test results:
Describe the purpose of the link function of a GLM. What is the identity link? Explain why it is not often used with binomial and Poisson responses.
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
Draw two pie charts, which allow the total yearly exports to be compared. Explain the trend in the export of fish as shown in the two pie charts.
If customers arrive according to a non-stationary Poisson process with rate function λ(t) = sin(t) + 5, is the time between the arrivals an exponential distribution?
If you have multiple regression output with 2 independent variables and R-Square is .9682, what does R-Square indicate?
Why is effective sampling important when performing a hypothesis test? What could happen if your sample is not appropriate to your study?
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