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The scores on a Standardized Reading Test are known to be normally distributed with a mean of µ = 10 and standard deviation of σ = 1.5. (a) Find the probability that a single individual selected at random scores between 9.4 and 10.6 on this test. (b) Find the probability that a random sample of 25 students has a mean score between 9.4 and 10.6 on this test.
A random sample of 100 people reveals that the sample average is 3.2 and the sample standard deviation is 2.1. Construct a 95% confidence interval for the population average.
A sample of 60 students from a large university is taken. The average age in the sample was 22 years with a standard deviation of 6 years.
In a different regression analysis, 40% of the variance was explained. The sum of squares total is 1000. What is the sum of squares of the predicted values?
How many different combinations are possible if 6 substitute workers are available to fill 3 openings created by employees planning to take vacation leave next week?
What happens to the length of a confidence interval for the mean of a normal distribution when the sample size is doubled? What happens if it is quadrupled?
In the drug testing, assume there are three possible test results: positive, negative, and inconclusive.
the piron software company currently develops marketing software for primarily service-based organizations. they
How can you use the SPSS Help function to get information on transforming data in an attempt to get a more normal distribution of values?
In terms of PX (k ), find the PMF of the random variable Y if its probability-generating function is given as in each of the following cases.
a suppose that we wish to test the hypotheses h0 p 0.12 versus ha p lt0.12. if the test statistic is 1.57 find the
Out of 100 light bulbs in a box, 80 are good and 20 are bad. What is the probability of choosing the sequence Good, Bad, Good out of ten tries (dependent event)
Is security a technical issue? A business issue? Both ? Support your answer. (Hint: Read Kim Nash, "Why Technology Isn't the Answer to Better Security,"
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