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Discuss something you have witnessed or observed in nature. Discuss the temptation to imply or infer causality and be sure to identify areas of future investigation that might be warranted to determine cause and effect.
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
A Pew research study recently randomly selected two groups of people, men and women and asked them if they agree with the following statement:
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
Use the method of least squares to model the relationship between x and y.
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
What is an example of data that can be transformed from one level of measurement to another, and another example of data that cannot be transformed?
Which of these variables are discrete and which are continuous random variables?
The coffee/soup machine at the local bus station is supposed to fill cups with 6 ounces of soup. Ten cups of soup are brought with results of a mean of 5.93 ounces and a standard deviation of 0.13 ounces. Construct a 99% confidence interval for th..
Construct the 95 percent confidence interval for the difference between the two population means.
Explain why the t distribution is used as a part of the confidence interval.
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
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