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On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
Develop a regression model that could be used to predict the final average in the course based on the first test grade. Predict the final average of a student who made an 83 on the first grade.
If the test contains 250 questions, what is the probability that Julie will score 75% or lower? (Use the normal approximation to the sampling distribution to solve this problem.)
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
Hagger Engineering Corporation is considering undertaking several proposed projects for the next fiscal year. The projects, the number of engineers and the number of support personnel necessary for each project.
From the course text and research I am able to create a frequency band with a single number (ie. 10, 20, 30, etc.). However, I am having difficulty creating the band with a number range (ie. $0-$999,999 or $1,000,000-$5,000,000).
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the ..
For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Management is concerned. Perform a hypothesis test to determine if this change in sales is a potential problem.
When an experiment is conducted, one variable is manipulated to see the impact on another variable -- that's why experiments address causation.
If you have multiple regression output with 2 independent variables and R-Square is .9682, what does R-Square indicate?
Define, describe and provide an example of the Komologrov-Smirnov distribution. Use MS-Excel (if possible) to solve this problem, also Show all your work in obtaining the answer.
You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenien..
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