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1. In which of the following situations is bootstrapping (and other resampling methods) often used?
A. When data have been collected using a probability sampling plan but the data may be strongly skewed.B. With haphazard sampling schemes when the data don't follow a Normal distribution.C. When data have been properly collected using a probability sampling plan, but some of the data are missing.D. With voluntary response surveys where the data don't follow a Normal distribution.
2. Which of the following is a valid description of the bootstrapping method?
A. New bootstrap samples are selected from the original population with replacement. For each bootstrap sample we compute a statistic. We find the distribution of the statistic over many bootstrap samples.B. New bootstrap samples are selected from the original data with replacement. For each bootstrap sample we compute a statistic. We find the distribution of the statistic over many bootstrap samples.C. New bootstrap samples are selected from the original data with replacement. For each bootstrap sample we compute the parameter of interest. We find the distribution of the parameter over many bootstrap samples.D. New bootstrap samples are selected from the original data with replacement. For each bootstrap sample we compute the statistic of interest. We find the distribution of the data over the many bootstrap samples.
Levels of employee motivation in his organization are dropping leading to drop in employee productivity. Draft a research proposal to identify the problem and suggest a methodology for recommending a solution.
Assume that the master budget for Cannondale shows total variable expenses of $10,000. The budget was based on production of 5,000 units. Cannondale sells all units it produces.
She gathers a sample of 35 subjects with depression and obtains a sample mean of 7.82 micrograms/100 ml. What are the null and alternative hypotheses for this study?
Use the Fama-French 3-Factor model to run the following tests and alternative techniques to account for violations of the classical linear regression assumptions
A manufacturer of batteries offers a two-year limited warranty. If the battery fails for any reason during the first two years, it is replaced. What percentage of the batteries is expected to fail within the warranty period?
Using the confidence interval when conducting a two-tail test for the population mean we do not reject the null hypothesis if the hypothesized value for:
Determine the margin of error in estimating the population mean. Sample of 68 college students yields a mean annual income of $3248. Assuming that the standard deviation = $885.
Quantify the uncertainty of your estimate by giving the standard deviation of the distribution. Round your response to at least three decimal places.
Which test do we use to see if the difference in our sample is statistically significant? Why? Should it be one or two-tailed?
A normal population has a mean of 80.0 and a standard deviation of 14.0. Compute the probability of a value between 75.0 and 90.0.
How large a sample should be taken if the desired margin of error is?
Create a set of data that can be modeled as a polynomial function. Please provide a reference to the data. Plot the data using Microsoft Excel including the equation for the fit.
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