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The growing seasons for a random sample of 35 U.S. cities were recorded, yielding a sample mean of 190.7 days and a sample standard deviation of 54.2 days. Estimate the true mean population of the growing season with 95% confidence.
Employees of a local company are classified according to gender and job type. The following table summarizes the number of people in each job category.
Preference to change blades is recorded. Do the data support the twin-blade manufacturer's claim? α=.05. This is a t-tests independent samples.
A regional commuter airline selected a random sample of 25 flights and found that the correlation between the number of passengers and the total weight, in pounds, of luggage stored in the luggage compartment is 0.94.
What is the difference between resampling (bootstrapping) and double sampling in research? Is there any difference or is the same? Please explain your response?
A recent survey by alumni of a major university indicated that average salary of 8000 of its 250,000 graduates was $120,000. Does this signify population parameter or sample statistic?
Explain thoroughly, the concept of standard deviation. How does range affect standard deviation? What is a z-score, and how do z-scores relate to the mean of a set of data?
What is the shape mean and standard deviation of the resulting distribution of the sample mean? What is the probability that the mean of the sample of 42 is more than 52 hours?
Find the probability that the student 's test score is more than 39.8. Find the probability that the student's test score is between 33.5 and 41.9.
Caculate the expected value of the profit made by the insurance company. Many call this kind of situation a win win opportunity for the insurance company and the promoter. Do you agree? Explain.
ACT scores of high school seniors. The scores of high school seniors on the ACT college entrance examination in 2003 had mean JL = 20.80 and standard deviation (J = 4.80. The distribution of scores is only roughly Normal.
What is the probability that a respondent said neither the Big Ten nor the Pac-10 would have a team in the Rose Bowl?
Is the dependent variable discrete or continuous? interval, or ratio) is used to measure the dependent variable?
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