A dentist is researching time spent teeth brushing. A sample of 13 brushing times is collected and list below. 130 100 90 79 95 45 160 25 80 100 125 85 95 The Sample mean is x-bar = __________
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.
A dentist is researching time spent teeth brushing. A sample of 13 brushing times is collected and list below.
| 130 | 100 | 90 | 79 | 95 | 45 | 160 |
| 25 | 80 | 100 | 125 | 85 | 95 |
The Sample
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