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Give a brief definition and an example of the following:
a. Descriptive Statisticsb. Inferential Statistics
What does the correlation coefficient r describe? What about r squared?
What can one conclude about the librarian's hypothesis at a level of significance of .05?
A sample of 23 European countries found that variance of life expectancy was 7.3 years. Determine the 95% confidence interval estimate for variance of life expectancy in Europe?
Write a brief summary of the distribution of life expectancy.
A game involving a pair of dice pays you 3 with probability 17/36, costs you 2 with probability 14/36, and costs you 4 with probability 5/36. What is your probability of losing money in one play of the game?
The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly.
In a clinical study of an allergy drug, 115 of the 204 subjects reported experiencing significant relief from their symptoms. At the 0.01 significance level, test the claim that more than half of all those using the drug experience relief.
Create the estimated regression equation by calculating the values of b 0 and b 1
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
Develop a 99% confidence interval for the population proportion.
If statistically significant, do you believe the difference is large enough to be significant? If so, to whom, and explain why? Is normality assumption fulfilled? Describe.
Draw the suitable 2x2 table, compute and interpret suitable measure of association.
a. What is the probability that one randomly selected student scores above 1100 on the GRE? b. Describe the sampling distribution of the sample mean for the 16 students.
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