At their inauguration, the ages of the first six (out of a current number of 45) presidents of a certain country were 65, 57, 63, 50, 57, and 55 . Complete parts a and b below. a. Find the mean age at inauguration of the first six presidents. The mean is 57.857.8. (Round to the nearest tenth as needed.) The mean of the most recent six presidents was 59.6. Did the first six presidents tend to be a bit older or a bit younger than the most recent six presidents? older Your answer is not correct. younger This is the correct answer. b. Find the standard deviation of the ages at inauguration of the first six presidents. The standard deviation is 1010. (Round to the nearest tenth as needed.)
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.
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