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Togus Bash
STATISTICS
-
Probability Distributions
In a normal distribution, what does the 95% confidence interval represent?
A. 95% of the data lies within the interval.
B. 95% of the population lies within the interval.
C. 95% of the time the sample mean will fall within the interval.
D. 95% of the time the population mean will fall within the interval.
Togus Bash
STATISTICS
-
Probability Distributions
What is the relationship between the mean and variance in an exponential distribution?
A. Mean is always greater than variance.
B. Variance is always greater than mean.
C. Mean and variance are always equal.
D. Mean and variance are not necessarily equal.
Togus Bash
STATISTICS
-
Probability Distributions
In a hypergeometric distribution, what is the main assumption?
A. Sampling is done with replacement.
B. Sampling is done without replacement.
C. Population size is infinite.
D. Events occur independently.
Togus Bash
STATISTICS
-
Probability Distributions
What is the purpose of the Poisson approximation to the binomial distribution?
A. To simplify calculations.
B. To make the binomial distribution discrete.
C. To make the binomial distribution continuous.
D. To make the binomial distribution normal.
Togus Bash
STATISTICS
-
Probability Distributions
In an exponential distribution, what does the parameter ? represent?
A. Mean.
B. Variance.
C. Standard deviation.
D. Rate parameter.
Togus Bash
STATISTICS
-
Probability Distributions
What is the relationship between the normal and binomial distributions?
A. Binomial distribution approaches normal distribution as n increases and p is close to 0.5.
B. Binomial distribution is always normal.
C. Normal distribution is always binomial.
D. There is no relationship between the two distributions.
Togus Bash
STATISTICS
-
Probability Distributions
In a geometric distribution, what is the expected number of trials until the first success?
A. 1/p.
B. p.
C. 1-p.
D. p/(1-p).
Togus Bash
STATISTICS
-
Probability Distributions
What is the main assumption of the Poisson distribution?
A. Events occur independently.
B. Events occur at a constant rate.
C. Events occur in continuous time.
D. Events occur in discrete time.
Togus Bash
STATISTICS
-
Probability Distributions
In a normal distribution, what does the 68-95-99
A. 68% of data lies within 1 standard deviation, 95% within 2 standard deviations, and 99.7% within 3 standard deviations.
B. 95% of data lies within 1 standard deviation, 99.7% within 2 standard deviations, and 99.9% within 3 standard deviations.
C. 68% of data lies within 1 standard deviation, 95% within 3 standard deviations, and 99.7% within 5 standard deviations.
D. 95% of data lies within 1 standard deviation, 99.7% within 2 standard deviations, and 99.9% within 4 standard deviations.
Togus Bash
STATISTICS
-
Probability Distributions
Which of the following is a continuous probability distribution?
A. Binomial distribution.
B. Poisson distribution.
C. Exponential distribution.
D. Hypergeometric distribution.
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STATISTICS
Inferential Statistics
Time Series Analysis
Probability Distributions
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