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A professor in a large statistics class has a grading policy such that only the 15% of the students with the highest scores will receive the grade A. The mean score for this class is 72 with a standard deviation of 6. Assuming that all the grades for this class follow a normal probability distribution, what is the minimum score that a student in this class has to get to receive an A grade?
Multiple choices based on regression analysis - how much or how many but instead is assigned values to represent categories
1. the labor relations manager of a large corporation wished to study the absenteeism among workers at the companys
Standard deviation is 35 hours. Is the company making acceptable light bulbs? Assume life spans are normally distributed.
if the population mean is expected to be 85 and the sample mean is 80 the sample standard deviation is 2 and the sample
The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
you are given the following data.number of absencesfinal grade093192284377467559i find the correlation coefficient for
What is a discrete random variable and how does it differ from a continuous random variable? Give examples.
Which samples show unequal variances? Use α = .05 in all tests. Show the critical values and degrees of freedom clearly and illustrate the decision rule.
a student parks his car illegally on campus for a period of exactly one hour. parking enforcement personnel check the
Create a research question for which the appropriate test of the statistical hypothesis would require the use of a z-score.
How many subjects must be tested to determine the effectiveness of the product?
Suppose that 1% of all people have a particular disease. A test for the disease is 99% accurate. This means that a person who test positive for the disease has a 99% chance of actually having the disease
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