Continuous Distribution Quiz
The question sheet
Reveal any answer as you study-
The uniform distribution has outcomes over its domain that are:
- Randomly weighted
- Increasingly likely
- Equally likely
- Rarely occurring
Reveal answer
Answer: Equally likely
Source evidence
PDF page 340: memoryless property for an exponential random variable X, the statement that knowledge of what has occurred in the past has no effect on future probabilities This means that the probability that X exceeds x + k, given that it has exceeded x, is the same as the probability that X would exceed k if we had no knowledge about it. In symbols we say that P(X > x + k|X > x) = P(X > k). Poisson distribution a distribution function that gives the probability of a number of events occurring in a fixed interval of time or space if these events happen with a known average rate and independently of the time since the last event; if there is a known average of λ events occurring per unit time, and these events are independent of each other, then the number of events X occurring in one unit of time has the Poisson distribution. The probability of k events occurring in one unit time is equal to . uniform distribution a continuous random variable (RV) that has equally likely outcomes over the domain, a < x < b. Notation—X ~ U(a,b).
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The notation for a uniform distribution is:
- X ~ N(0,1)
- X ~ Exp(m)
- X ~ B(n,p)
- X ~ U(a,b)
Reveal answer
Answer: X ~ U(a,b)
Source evidence
PDF page 340: memoryless property for an exponential random variable X, the statement that knowledge of what has occurred in the past has no effect on future probabilities This means that the probability that X exceeds x + k, given that it has exceeded x, is the same as the probability that X would exceed k if we had no knowledge about it. In symbols we say that P(X > x + k|X > x) = P(X > k). Poisson distribution a distribution function that gives the probability of a number of events occurring in a fixed interval of time or space if these events happen with a known average rate and independently of the time since the last event; if there is a known average of λ events occurring per unit time, and these events are independent of each other, then the number of events X occurring in one unit of time has the Poisson distribution. The probability of k events occurring in one unit time is equal to . uniform distribution a continuous random variable (RV) that has equally likely outcomes over the domain, a < x < b. Notation—X ~ U(a,b).
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The notation for an exponential random variable is:
- X ~ Exp(m)
- X ~ U(a,b)
- X ~ N(μ,σ)
- X ~ G(p)
Reveal answer
Answer: X ~ Exp(m)
Source evidence
PDF page 340: exponential distribution a continuous random variable (RV) that appears when we are interested in the intervals of time between some random events, for example, the length of time between emergency arrivals at a hospital; the notation is X ~ Exp(m). −mx
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The decay parameter is the value m in which function?
- Linear regression
- Cumulative frequency
- Correlation function
- Probability density function
Reveal answer
Answer: Probability density function
Source evidence
PDF page 340: conditional probability the likelihood that an event will occur given that another event has already occurred decay parameter The decay parameter describes the rate at which probabilities decay to zero for increasing values of x. (–mx) It is the value m in the probability density function f(x) = me of an exponential random variable.
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The memoryless property means knowledge of the past has:
- A reducing effect
- An unknown effect
- A doubling effect
- No effect on future probabilities
Reveal answer
Answer: No effect on future probabilities
Source evidence
PDF page 340: memoryless property for an exponential random variable X, the statement that knowledge of what has occurred in the past has no effect on future probabilities This means that the probability that X exceeds x + k, given that it has exceeded x, is the same as the probability that X would exceed k if we had no knowledge about it. In symbols we say that P(X > x + k|X > x) = P(X > k). Poisson distribution a distribution function that gives the probability of a number of events occurring in a fixed interval of time or space if these events happen with a known average rate and independently of the time since the last event; if there is a known average of λ events occurring per unit time, and these events are independent of each other, then the number of events X occurring in one unit of time has the Poisson distribution. The probability of k events occurring in one unit time is equal to . uniform distribution a continuous random variable (RV) that has equally likely outcomes over the domain, a < x < b. Notation—X ~ U(a,b).
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For an exponential RV, P(X > x + k | X > x) equals:
- 1
- P(X < k)
- P(X > x)
- P(X > k)
Reveal answer
Answer: P(X > k)
Source evidence
PDF page 340: memoryless property for an exponential random variable X, the statement that knowledge of what has occurred in the past has no effect on future probabilities This means that the probability that X exceeds x + k, given that it has exceeded x, is the same as the probability that X would exceed k if we had no knowledge about it. In symbols we say that P(X > x + k|X > x) = P(X > k). Poisson distribution a distribution function that gives the probability of a number of events occurring in a fixed interval of time or space if these events happen with a known average rate and independently of the time since the last event; if there is a known average of λ events occurring per unit time, and these events are independent of each other, then the number of events X occurring in one unit of time has the Poisson distribution. The probability of k events occurring in one unit time is equal to . uniform distribution a continuous random variable (RV) that has equally likely outcomes over the domain, a < x < b. Notation—X ~ U(a,b).
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The Poisson distribution gives the probability of a number of events occurring in a fixed interval of:
- Time or space
- Weight only
- Volume only
- Distance only
Reveal answer
Answer: Time or space
Source evidence
PDF page 340: memoryless property for an exponential random variable X, the statement that knowledge of what has occurred in the past has no effect on future probabilities This means that the probability that X exceeds x + k, given that it has exceeded x, is the same as the probability that X would exceed k if we had no knowledge about it. In symbols we say that P(X > x + k|X > x) = P(X > k). Poisson distribution a distribution function that gives the probability of a number of events occurring in a fixed interval of time or space if these events happen with a known average rate and independently of the time since the last event; if there is a known average of λ events occurring per unit time, and these events are independent of each other, then the number of events X occurring in one unit of time has the Poisson distribution. The probability of k events occurring in one unit time is equal to . uniform distribution a continuous random variable (RV) that has equally likely outcomes over the domain, a < x < b. Notation—X ~ U(a,b).
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The Poisson distribution requires events happen with a known:
- Fixed maximum
- Increasing rate
- Average rate independently
- Weighted correlation
Reveal answer
Answer: Average rate independently
Source evidence
PDF page 340: memoryless property for an exponential random variable X, the statement that knowledge of what has occurred in the past has no effect on future probabilities This means that the probability that X exceeds x + k, given that it has exceeded x, is the same as the probability that X would exceed k if we had no knowledge about it. In symbols we say that P(X > x + k|X > x) = P(X > k). Poisson distribution a distribution function that gives the probability of a number of events occurring in a fixed interval of time or space if these events happen with a known average rate and independently of the time since the last event; if there is a known average of λ events occurring per unit time, and these events are independent of each other, then the number of events X occurring in one unit of time has the Poisson distribution. The probability of k events occurring in one unit time is equal to . uniform distribution a continuous random variable (RV) that has equally likely outcomes over the domain, a < x < b. Notation—X ~ U(a,b).
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Conditional probability is the likelihood an event occurs given that:
- Another event already occurred
- No other event occurred
- Two events are equal
- All events are impossible
Reveal answer
Answer: Another event already occurred
Source evidence
PDF page 340: conditional probability the likelihood that an event will occur given that another event has already occurred decay parameter The decay parameter describes the rate at which probabilities decay to zero for increasing values of x. (–mx) It is the value m in the probability density function f(x) = me of an exponential random variable.
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In the activity, how many values are generated between zero and one?
- 50
- 100
- 10
- 25
Reveal answer
Answer: 50
Source evidence
PDF page 337: distribution. Collect the Data Use a random number generator to generate 50 values between zero and one (inclusive). List them in Table 5.3. Round the numbers to four decimal places or set the calculator MODE to four places.
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The random number generator values should be rounded to how many decimal places?
- Two
- Three
- Five
- Four
Reveal answer
Answer: Four
Source evidence
PDF page 337: distribution. Collect the Data Use a random number generator to generate 50 values between zero and one (inclusive). List them in Table 5.3. Round the numbers to four decimal places or set the calculator MODE to four places.
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The student compares empirical data from a random number generator with the:
- Uniform distribution
- Normal distribution
- Poisson distribution
- Exponential distribution
Reveal answer
Answer: Uniform distribution
Source evidence
PDF page 337: • The student will compare and contrast empirical data from a random number generator with the uniform
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