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Devry Math221 all discussions (week 1-7)




Question;Week 1;Descriptive Statistics (graded);If;you were given a large data set such as the sales over the last year of our top;1,000 customers, what might you be able to do with this data? What might be the;benefits of describing the data?;Week 2;Regression (graded);Suppose;you are given data from a survey showing the IQ of each person interviewed and;the IQ of his or her mother. That is all the information that you have. Your;boss has asked you to put together a report showing the relationship between;these two variables. What could you present and why?;Week 3;Statistics in the News (graded);Keep;your eyes and ears open as you read or listen to the news this week.;Find/discover an example of statistics in the news to discuss the following;statement that represents one of the objectives of statistics analysis;?Statistics helps us make decisions based on data analysis.? Briefly discuss;how the news item or article meets this objective. Cite your references.;Week 4;Discrete Probability Variables;(graded);What;are examples of variables that follow a binomial probability distribution? What;are examples of variables that follow a Poisson distribution? When might you;use a geometric probability?;Week 5;Interpreting Normal Distributions;(graded);Assume;that a population is normally distributed with a mean of 100 and a standard;deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or;more? Why or why not?;Week 6;Confidence Interval Concepts (graded);Consider;the formula used for any confidence interval and the elements included in that;formula. What happens to the confidence interval if you (a) increase the;confidence level, (b) increase the sample size, or (c) increase the margin of;error? Only consider one of these changes at a time. Explain your answer with;words and by referencing the formula.;Week 7;Rejection Region (graded);How;is the rejection region defined and how is that related to the z-score and the;p value? When do you reject or fail to reject the null hypothesis? Why do you;think statisticians are asked to complete hypothesis testing? Can you think of;examples in courts, in medicine, or in your area?


Paper#60679 | Written in 18-Jul-2015

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