## Data Analysis and Economic Forecasting
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These questions are from the test bank. Some questions have multiple parts. | ||||||||||||||||||||||||

## Theoretical Questions | ||||||||||||||||||||||||

1. If you have mean, mode, and median, which ones are sensitive
to outliers in the data? If you have a range and standard deviation, which ones are sensitive to outliers? 2. What are continuous, discrete, and categorical variables? Does the data matter how we analyze our data? 3. What is the difference between standard error and standard deviation? 4. Why do statisticians use the t-statistic, rather than the z-values from a normal distribution, when making inferences about the population parameters? 5. What is stratified random sampling? Is there any potential biases if a researcher uses this method? 6. What are some methods you can use to determine if you have a skewed distribution? 7. What are Box-Whisker Plots? What are the benefits of these plots? 8. A random sample requires three conditions for it to be truly random. What are the three conditions? 9. What are Type I and Type II errors? Do these errors have tradeoffs? | ||||||||||||||||||||||||

## Empirical Questions | ||||||||||||||||||||||||

10. You are given the following sample data, please calculate the
mean, mode, and median. 9 1 9 6 5 2 10 9 8 9 11.Explain how you can obtain 100 random numbers in Excel that are
normally distributed with a mean of 100 and standard deviation of 15. 12.Using the data below, please construct a leaf plot. 5.3 3.0 1.6 8.4 1.7 7.4 5.5 7.2 6.0 13.Using the information below, please construct a histogram?
14.Unfortunately, Excel does not make it easy to construct a
histogram. What are the steps in constructing one? Must contain three parts. 15.You sampled one hundred students from the university, 35 students plan to pursue a Master's degree. (i) Please calculate the mean, variance and standard error for this data. 16.In 2008, the United States had 300 billionaires. In 2009, the billionaire club shrinks to 100. Check the hypothesis that his drop is do to random sampling error. (i) Which distribution are you using? 17.You have 10,000 surveys from people who live in the City of Almaty and 5,000 surveys from people who live in Astana. You calculate the average income and standard deviation. The average income for Almaty is $600 per month and the standard deviation is $100, while the average income for Astana is $800 per month and a standard deviation of $200. (i) Test the hypothesis that incomes are the same for both cities, assuming the calculated standard deviation is equal to the true population standard deviation. Designed by Kenneth R. Szulczyk ©2011 |
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