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This sample is relatively more weighted towards the rst stratum where almost 20% of the stratum was sampled compared to the second stratum where only 2% of the stratum was sampled. Will this phenomenon introduce bias into the above estimates?
A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. What is the standard deviation (in minutes)?
Use the five-step p-value approach to hypothesis testing and a 0.05 level of significance to determine whether the proportion of full-time students at Miami University is different from the national norm of 0.46.
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
He is equally likely to select any. Billy leaves last and takes the one remaining hat. Let x be the number of cowboys who end up with the correct hat.
If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values,
A business owner decides to use a binomial distribution to solve one of his problems. He knows there is a 60 percent probability that he will sell one of his Red Oak floors to any customer who comes into his shop and views the wood.
Determine the best replacement policy over the next five years?
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
Suppose that a survey is being planned for purposes of estimating the average number of hours spent exercising daily by adults (18 years of age or older) living in a certain community.
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
a) Explain why it would be hard to take a Simple Random Sample? b) Describe how to take a cluster sample of chocolate chip cookies.
In patients with congestive heart failure, two or more drugs were prescribed in 257 of 437 U.S. patients. In Scotland, 39 of 179 patients had two or more drugs prescribed
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