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Consider two populations I and II. Suppose that 80 percent of the men and 30 percent of the women in population 1 have a certain characteristic; and that only 60 percent of the men and 10 percent of the women in population 11 have the characteristic. Explain how, under these conditions, it might be true that the proportion of population II having the characteristic is larger than the proportion of population I having the characteristic.
A lottery game is played by choosing six whole numbers between 1 and 49. The grand prize is won if all six numbers chosen match the winning numbers drawn.
Find probability that the mean of the sample is less than $445. Place your answer, rounded to 4 decimal places, in the blank.
After calculating the sample size needed to estimate a population proportion to within 0.04, your statistics professor told you the maximum allowable error must be reduced to just .01. If the original calculation led to a sample size of 800, the s..
If the principal wants to be 50% certain the bus system will break even, approximately what monthy transportation fee should he charge?
Confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 10 milligrams?
Explain why it would be much more surprising if someone were to flip a coin and get six heads in a row after telling you they were going to do so.
Many studies show that interspersing rest between practice sessions (spaced practice) produces better performance than a no-rest condition (massed practice).
What is the mean weight of my ancient gold coins? How do you consider this collection, a population or a sample? Why? What is the variance (σ2) and standard deviation (σ) in weight of my coin collection? (Remember, depending on whether you consider..
Calculate x2, s2 and s for the expense data. Show that the two different formulas for calculating s2 give the same result.
Suppose that, in a sample of 200, we observe 140 successes. Is this sufficient evidence at the 1% significance level to indicate the the population proportion of successes is greater than 65%
Find the F-test statistic to test the claim that the population variances are equal. Both distributions are normal. The standard deviation of the first sample.
Use random sampling of clusters to estimate the mean or total of a population of your choice. In the process of carrying out the survey and making the estimate, think about or discuss with others the following:
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