Grouped Data: Anthropology What was the age distribution of prehistoric Native Americans? Extensive anthropologic studies in the southwestern United States gave the following information about a prehistoric extended family group of 80 members on what is now the Navajo Reservation in northwestern New Mexico (Source: Based on information taken from Prehistory in the Navajo Reservation Districst . by F.W. Eddy. Museum of New Mexico Press). Age range (years) 1-10* 11-20 21-30 31and over Number of Individuals 34 18 17 11 Includes interest For this community, estimate the mean age expressed in years, the sample variance, and the sample standard deviation. For the class31and over, use 35.5 as the class midpoint.
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.
Grouped Data: Anthropology What was the age distribution of prehistoric Native Americans? Extensive anthropologic studies in the southwestern United States gave the following information about a prehistoric extended family group of 80 members on what is now the Navajo Reservation in northwestern New Mexico (Source: Based on information taken from Prehistory in the Navajo Reservation Districst . by F.W. Eddy. Museum of New Mexico Press).
|
Age |
1-10* |
11-20 |
21-30 |
31and over |
|
Number of Individuals |
34 |
18 |
17 |
11 |
Includes interest
For this community, estimate the
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