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Flu cases this past fly season in the Central City school system were about 15 per week. For the entire state, the weekly average is 16 and the standard deviation, 2.35. Are the kids in Central City as sick as the kids throughout the state?
What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
Assume the probability that a person has the desease is 0.03 for all people, independently of each other, and compute the expected number of tests necessary for each group.
What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
What is the p-value and compute a 95% CI for the difference in means between the two groups?
What is the probability that a respondent said neither the Big Ten nor the Pac-10 will have a team in the Rose Bowl?
Tay-Sachs couples. Approximately 1 in 28 people of Ashkenazi Jewish descent are Tay-Sachs carriers. In randomly sampling one man and one woman from this population, what is the probability neither is a Tay-Sachs carrier?
During 2001, 61.3% of US households purchased ground coffee.These households spent an average of $36.16 on ground coffee during the year.
Medical tests were conducted to learn about drug-resistant tuberculosis. Of 142 cases tested in NJ, 9 were found to be drug-resistant. Of 268 cases tested in Tx, 5 were found to be drug-resistant.
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
Calculate the standard deviation of the data. For this calculation compute the difference between each one of the observations and the mean.
Only 10% of those who don't study get an A, what is the probability that someone who gets an A actually studied for the test.
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