The data were collected from a statistics class. The column head gives the variable, and each of the rows represents a student in the class. Is the variable Age numerical or categorical? Credits Weight Number of Siblings This Handedness (kg) MaleAgeEye ColourShoe SizeHeight (metres) Session 0. 19 Blue 10 1.92 74 Left 32 Blue 7.5 1.82 48 1 Right 1. 30 Blue 9.5 1.53 81 1 Right 7.5 21 Brown 7.5 1.67 69 1 7.5 Right a. The variable is numerical because the values are numbers. Ob. The variable is categorical because the values are categories. The variable is numerical despite the values being categories. O d. The variable is categorical despite the values being numbers.
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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