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1. If one student is randomly selected from the USA born group, find the probability of getting someone between the ages of 20 and 25. the mean is 28.63 and st div is 12.60
2. If 9 students are randomly selected from the Non-USA born group, find the probability that their mean age is between 22 and 37.the mean is 30.16 and st div is 9.87
3. If 25 students are randomly selected from the USA born group, find the probability that their mean GPA is between 2.50 and 3.50. mean 3.41 st div .43
If each professor has an equal chance of being selected, what is the probability that both professors are chemistry professors?
Which of the following exam scores should lead to the better grade?
Your population consists of 28,209 customers. Convert the percentages representing the endpoints of the confidence interval in part b to numbers of people.
Joe is waiting in continuous time for a book called The Winds of Winter to be released. Suppose that the waiting time T until news of the book's release.
suppose the cost of an observation varies from stratum to stratum where the cost of sampling a unit from stratum j is
When studying the simultaneous responses to two categorical questions, we should set up a:
a researcher calculates a statistical test and obtains a p value of .86. he decides to reject the null hypothesis. is
a. Find the mean value of x (the mean number of systems sold). b. Find the variance and standard deviation of x. How would you interpret these values? c. What is the probability that the number of systems sold is within 1 standard deviation of its me..
The U.S. Census Bureau (2000 census) reported the following relative frequency distribution for travel time to work for a large sample of adults who did not
a. State an appropriate null hypothesis. b. What is the value of the calculated test statistic (t)?
Ethical Guidelines for Statistical- Why is it important to statistics ethically? Give an example of unethical use of statistics and explain why it is unethical.
Does sample size make a difference? What assumptions do we need to make in using the t-distribution for the construction of a con?dence interval?
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