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As part of his review for a chemistry test, a student randomly selects (without replacement) 40 out of 102 elements listed on the standard tables, and tries to guess their atomic numbers. Given that the mean of all 102 atomic numbers is 51.794, and the population standard deviation is 29.804, what is the probability that the mean of the 40 atomic numbers selected by the student will be at least 58.3?
Find the probability that a random selection of 9 songs will have mean length of 186.30 seconds or less. Assume distribution of the lengths of the songs is normal.
Time spent using e-mail per session is normally distributed, with μ = 8 minutes, and σ = 2 minutes. If you select a random sample of 25 sessions,
If the city manager knows the average salary nationally is $38,300, which test of significance should be used? Why?
Please use a combination of content and supportive examples.
For each of the 50 states and Washington, D.C., a number of statistics related to education are available for 1992
A population whose shape is unknown has a median of 75. You selected a sample of 40. The standard deviation of the median is 5. Calculate the probability that the median of the sample or average medians is:
Based on the result, does there to be an overall perception of 1 minute that is reasonably accurate?
What does standard deviation measure? In looking at the standard deviations of the "with fireplace" and "without fireplace" selling prices, one is much larger than the other.
The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test.
In addition, record the values for the UCL, center line, and LCL. Also, record any points that are out of control. Use a z-value of three.
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
Research question : At α = . 05, is cockpit noise level independent of flight phase?
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