The following table gives the extra travel time in hours for peak-period travelers in urban areas with more than 3 million people in a certain year. Urban Area Annual Hours of Delay per Traveler Los Angeles–Long Beach–Santa Ana, Ca 70 San Francisco–Oakland, CA 58 Atlanta, GA 61 Washington (D.C.–VA–MD) 60 Dallas–Fort Worth–Arlington, TX 51 Houston, TX 52 Find the mean of the extra travel time in that year, in hours, for peak-period travelers in urban areas with more than 3 million people. (Round your answer to two decimal places.) __hr What is the standard deviation for these data? (Round your answer to two decimal places.)
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 gives the extra travel time in hours for peak-period travelers in urban areas with more than 3 million people in a certain year.
| Urban Area | Annual Hours of Delay per Traveler |
|---|---|
| Los Angeles–Long Beach–Santa Ana, Ca | 70 |
| San Francisco–Oakland, CA | 58 |
| Atlanta, GA | 61 |
| Washington (D.C.–VA–MD) | 60 |
| Dallas–Fort Worth–Arlington, TX | 51 |
| Houston, TX | 52 |
Find the
__hr
What is the standard deviation for these data? (Round your answer to two decimal places.)
___hr
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