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Biostatistics Multiple Choice Questions: Binomial Distributions

Biostatistics Multiple Choice Questions: Binomial Distributions

Q: When using the binomial distribution to calculate probabilities, one is assuming that:
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a. You have a series of n independent trials.
b. The probability of ‘success’ might be different in each trial.
c. The possible values for the binomial random variable Y is 1,2,3,…,n.
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A: The answer is a.
CONCEPTS AND ASSUMPTIONS

– You have a series of n independent trials

– n is fixed.

– For each trial, there are two possible outcomes : ‘success’ and ‘failure

– The probability of ‘success’ on any one trial (p) is the same for all trials

– The trials are independent

– Since the trials are independent, one trial’s outcome doesn’t influence the outcome of other trials.

– The binomial random variable, Y, is the count of the number of successes in n trials

– The possible values for Y are 0,1,2…,n

Principles of Biostatistics (with CD-ROM)

Student Solutions Manual for Pagano/Gauvreau’s Principles of Biostatistics

Intuitive Biostatistics: A Nonmathematical Guide to Statistical Thinking

Biostatistics for the Biological and Health Sciences with Statdisk

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