In Exercises 5-20, find the range , variance, and standard deviation for the given sample data. Include appropriate units (such as “minutes”) in your results. (The same data were used in Section 3-1, where we found measures of center. Here we find measures of variation.) Then answer the given questions. 16. Most Expensive Colleges Listed below in dollars are the annual costs of tuition and fees at the 10 most expensive colleges in the United States for a recent year (based on data from U.S. News & World Report ). The colleges listed in order are Columbia, Vassar, Trinity, George Washington. Carnegie Mellon, Wesleyan, Tulane. Bucknell, Oberlin. and Union. What does this “top 10” list tell us about the variation among costs for the population of all U.S. college tuitions?
In Exercises 5-20, find the range , variance, and standard deviation for the given sample data. Include appropriate units (such as “minutes”) in your results. (The same data were used in Section 3-1, where we found measures of center. Here we find measures of variation.) Then answer the given questions. 16. Most Expensive Colleges Listed below in dollars are the annual costs of tuition and fees at the 10 most expensive colleges in the United States for a recent year (based on data from U.S. News & World Report ). The colleges listed in order are Columbia, Vassar, Trinity, George Washington. Carnegie Mellon, Wesleyan, Tulane. Bucknell, Oberlin. and Union. What does this “top 10” list tell us about the variation among costs for the population of all U.S. college tuitions?
In Exercises 5-20, find the range, variance, and standard deviation for the given sample data. Include appropriate units (such as “minutes”) in your results. (The same data were used in Section 3-1, where we found measures of center. Here we find measures of variation.) Then answer the given questions.
16. Most Expensive Colleges Listed below in dollars are the annual costs of tuition and fees at the 10 most expensive colleges in the United States for a recent year (based on data from U.S. News & World Report). The colleges listed in order are Columbia, Vassar, Trinity, George Washington. Carnegie Mellon, Wesleyan, Tulane. Bucknell, Oberlin. and Union. What does this “top 10” list tell us about the variation among costs for the population of all U.S. college tuitions?
During busy political seasons, many opinion polls are conducted. In apresidential race, how do you think the participants in polls are generally selected?Discuss any issues regarding simple random, stratified, systematic, cluster, andconvenience sampling in these polls. What about other types of polls, besides political?
Please could you explain why 0.5 was added to each upper limpit of the intervals.Thanks
28. (a) Under what conditions do we say that two random variables X and Y are
independent?
(b) Demonstrate that if X and Y are independent, then it follows that E(XY) =
E(X)E(Y);
(e) Show by a counter example that the converse of (ii) is not necessarily true.
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