Introduction to Statistical Analysis in Geography - Statistics Assignment Help

Assignment Task

Task

1. Using data from the “Engines” worksheet in the provided Excel Workbook, compute the interquartile range (IQR) test for the variables HC, CO, and NOX. Identify the outliers by shading the cells red. Include all values for the 5-number summary of the three variables.
2. Compute the z-scores for each observation and variable for the “Engines” data. Provide these as new columns in the data table.
3. Which observations (for variables: HC, CO, and NOX) are greater than or less than 1.96 standard deviations from the mean? Identify them in your table by shading cells with low values orange and high values green.
4. What are the critical values that define the 80th percentile for HC, 75th percentile for CO, and 90th percentile for NOX? Show your work on the worksheet without using the built-in functions for quantiles.
5. What are the 90?% and 99% confidence intervals for the mean of HC?
6. A sample of 17 states had these cigarette taxes (in cents) as provided in the Excel workbook on the “CigaretteTax” worksheet. Find the 98% confidence interval for the cigarette tax in all 50 states.
7.The Gallup Poll found that 27% of adults surveyed nationwide said they had personally been in a tornado. How many adults should be surveyed to estimate the true proportion of adults who have been in a tornado with a 95% confidence interval 5% wide

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