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Questions and Answers
What is the main purpose of a probability mass function for a discrete random variable?
What is the main purpose of a probability mass function for a discrete random variable?
- To calculate the probabilities of different values of the random variable (correct)
- To show the variability in the data distribution
- To compute the variance and standard deviation
- To graph the distribution using a histogram
In constructing a histogram for a discrete random variable, where are the possible values of the variable plotted?
In constructing a histogram for a discrete random variable, where are the possible values of the variable plotted?
- On the horizontal axis (correct)
- On the vertical axis
- On the x-axis
- On the y-axis
What is the relationship between the sum of probabilities in a probability mass function and the histogram's total area?
What is the relationship between the sum of probabilities in a probability mass function and the histogram's total area?
- They are equal (correct)
- They are unrelated
- Sum of probabilities is less than 1
- Sum of probabilities is greater than 1
How is the standard deviation related to the variance of a discrete random variable?
How is the standard deviation related to the variance of a discrete random variable?
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What does the formula for variance of a discrete random variable measure?
What does the formula for variance of a discrete random variable measure?
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