The following table shows the number of customer complaints against airlines operating in a country during the given year. Date 2002 2004 2006 2008 2010 Number of complaints 9474 7456 8335 10,656 16,508 Complete the table below with the absolute numbers and the percentages by which the complaints changed over each two-year period. Round your final answers to the nearest whole number. Range 2002-2004 2004-2006 2006-2008 2008-2010 Change in complaints Percentage change % % % %
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
The following table shows the number of customer complaints against airlines operating in a country during the given year.
| Date | 2002 | 2004 | 2006 | 2008 | 2010 |
| Number of complaints | 9474 | 7456 | 8335 | 10,656 | 16,508 |
Complete the table below with the absolute numbers and the percentages by which the complaints changed over each two-year period. Round your final answers to the nearest whole number.
| Range | 2002-2004 | 2004-2006 | 2006-2008 | 2008-2010 |
|---|---|---|---|---|
| Change in complaints | ||||
| Percentage change | % | % | % | % |
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