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The mean score of a college entrance test is 500, the standard deviation is 75 and the scores are normally distributed.
(a) What percent of the students scored below 320?
(b) What percent of the students scored between 400 and 525?
(c) Twenty percent of the students had a test score above what score?
The Wall Street Journal reported some interesting statistics on the job market. One statistic is that 40% of all workers say they would change jobs for "slightly higher pay."
The hypotheses for this scenario are as follows: Null Hypothesis: μ ≤ 21.61, Alternative Hypothesis: μ > 21.61. You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.0095. What is the appropriate concl..
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is ..
Why do so many of life's events share the same characteristics with Central Limit Theorem? Why are estimations and confidence intervals important?
The number of bombardment necessary to achieve the disintegration of a certain nucleus is assumed to have the distribution above. In one sequence in which b bombardments are available, of these have already failed to disintegrate the nucleus. What..
You want to determine whether or not an observational coding system you've created for ADHD is better as a system with 5 behavioral scales or 3 behavioral scales. What test should be run?
Otherwise, no ordering will take place. Find the steady-state probabilities of the state of this Markov chain?
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
Testing for Population mean - Based on this sample evidence, is Joan's supervisor correct? Use a = .05.
Perform a study to compare the characteristics of patients discharged against medical advice from the institution
Average number of mosquitoes in pond is 80 per square meter with a standard deviation of 12. If 16 square meters are choses at random for a mosquiot count, find probabilty that the average of those counts is more than 83.0 mosquitoes per square me..
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