Consider the table below describing a data set of folks who have registered to volunteer at a public school. Name Year born Phone number Number of siblings Annual income Jenny 1975 8929223 0 60000 Ted 1984 8675309 3 22500 ... ... ... ... ... Which of the variables are categorical and which are numerical? Categorical: Name, Phone number. Numerical: Year born, Number of siblings, Annual income. Categorical: Name. Numerical: Year born, Phone number, Number of siblings, Annual income. Categorical: Name, Phone number, Number of Siblings. Numerical: Year born, Annual income. All are categorical. None are numerical.
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.
Consider the table below describing a data set of folks who have registered to volunteer at a public school.
Name | Year born | Phone number | Number of siblings | Annual income |
---|---|---|---|---|
Jenny | 1975 | 8929223 | 0 | 60000 |
Ted | 1984 | 8675309 | 3 | 22500 |
... | ... | ... | ... | ... |
Which of the variables are categorical and which are numerical?
- Categorical: Name, Phone number. Numerical: Year born, Number of siblings, Annual income.
- Categorical: Name. Numerical: Year born, Phone number, Number of siblings, Annual income.
- Categorical: Name, Phone number, Number of Siblings. Numerical: Year born, Annual income.
- All are categorical. None are numerical.
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