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What is the probability a random sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the Critical Reading part of the test (to 4 decimals)?
A arbitrary sample of 8 students is selected. Illucidate the probability that among the students in the sample at least 7 are female.
Explain what property associated with the Central Limit Theorem you consider the most important contribution, enabling the use of the normal distribution for sample means.
To compare the effectiveness of two treatments 1 and 2 for a particular disease. Patients were separated in 2 treatment groups. A patient in group 1 received treatment 1 and patients in group 2 received treatment 2.
At a local supermarket receiving dock, the number of truck arrivals per day is recorded for 100 days. Estimate the mean from the sample.
Test the null hypothesis that a population mean is 50 against the alternate hypothesis that the mean is not 50. What "model" should be used and why?
Provide two examples for each source of measurement error and include how each example might likely influence research results.
if a gambler rolls a dice twice to get a sum of 10, he wins $10. and if he gets a sum of three, he wins $20. The cost to play the game is $5. What is the expectation of the game?
Form the cumulative percentage distribution and plan a cumulative percentage polygon.
Lengths of his classes are uniformly distributed between 45.0 and 55.0 minutes. Determine the probability that the given class period run less than 51.5 minutes.
In an experiment on a new drug to determine the most effective dosage and method of administration, subjects were randomly assigned to either 5, 10, 15, or 20 mg of the active drug.
Explain how we test independent against dependent variables in a regression analysis? What's the set up? How are regression analyses often misused / misinterpreted at work or in the news? Cite an example.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. What is the value of the population mea..
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