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A professor gives an exam for which there are two versions, A and B. Each student in the class is given one randomly selected version of the exam. After the exam, the professor wishes to determine if there is a difference in the level of difficulty of the two versions by determining if there is a significant difference in the mean scores. Assume a= 0.05.
Version A = sample size 45, mean score is 8.8 and the sample variance of 2.6
Version B = sample size 65, mean score is 8.2 and the sample variance of 2.4
What is the test value for this hypothesis test?
What is the critical value(e) for this hypothesis test? If there are two critical values, give only the positive value.
IQ scores from the general population form a normal distribution with a μ = 100 and σ = 15. However, data indicate that children's intelligence may be affected if their mothers have German measles during pregnancy.
Prepare a report using the numerical methods of descriptive statistics presented in this module to learn how the variables contribute to the success of a motion picture.
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True or false Registration of securities by the SEC indicates to investors that the risk of those securities is reasonable
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Quantitative Business Analysis - Find Correlation, simple linear, and Multiple Regression Analysis
Calculate the gross premium
The area under the density curve that lies between 15 and 20 is 0.414. What percentage of all possible observations of the variable are either less than 15 or greater than 20?
Calculate the sample size needed given these factors
Suppose that scores on the Math SAT exam follow a Normal distribution with mean 500 and standard deviation 100. Two students that have taken the exam are selected at random. What is the probability that the sum of their scores exceeds 1200?
The College Board finds that the distribution of students
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