19 Questions
What is a characteristic of an individual or organization that can be measured or observed?
A variable
What type of variable is defined by the categories into which individuals fall?
Categorical
What is the level of measurement that uses numbers to indicate rank or order?
Ordinal
Which level of measurement has an absolute zero point?
Ratio
What is a characteristic of numerical variables?
Defined by numbers
What is the main difference between discrete and continuous variables?
Discrete variables are obtained through counting, while continuous variables are obtained through measurement
What is the primary purpose of nominal level of measurement?
To identify or categorize individuals
What is the main limitation of using the range to measure variability?
It can be greatly affected by outliers in the data
What is the formula to calculate the range of a set of data?
R = Highest Score - Lowest Score
What is the primary use of measures of variability?
To describe the amount of spread or dispersion in a dataset
What is the variance of a dataset?
The expectation of the squared deviation of a random variable from its mean
What is the range of the scores given in the example: 75, 60, 50, 35, 80, 48, 100, 80, 46?
45
What is variability in a statistical distribution or dataset?
The extent to which data points differ from each other and the mean value
What is the significance of a low standard deviation?
The data points tend to be close to the mean of the set
What is the formula to calculate the variance?
s = √(X - Xm)^2 / n
What does a negative skew indicate?
The left tail is longer
What is kurtosis a measure of?
The sharpness of the peak of a frequency-distribution curve
What is the kurtosis of any univariate normal distribution?
3
What is the purpose of the standard deviation?
To quantify the amount of variation or dispersion of a set of data values
Learn about the different types of variables, including categorical and numerical variables, and how they are used in research. Understand the concept of scales of measurement and how they are applied in various fields.
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