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Muntaha Nasir
STATISTICS
-
Time Series Analysis
Which of the following methods is NOT used for model selection in time series analysis?
A. AIC.
B. BIC.
C. MSE.
D. PCA.
Muntaha Nasir
STATISTICS
-
Time Series Analysis
In ARIMA models, what does the 'I' stand for?
A. Interpolation.
B. Integration.
C. Imputation.
D. Iteration.
Muntaha Nasir
STATISTICS
-
Time Series Analysis
What is the primary purpose of differencing a time series?
A. To remove seasonality.
B. To stabilize variance.
C. To achieve stationarity.
D. To remove outliers.
Muntaha Nasir
STATISTICS
-
Time Series Analysis
Which of the following is a key assumption of stationarity in time series analysis?
A. Mean of the series is constant over time.
B. Variance of the series is constant over time.
C. Autocovariance does not depend on time.
D. All of the above.
Togus Bash
STATISTICS
-
Probability Distributions
In an exponential distribution, what is the cumulative distribution function?
A. F(x) = 1 - e^(-?x).
B. F(x) = (?^x * e^(-?)) / x!.
C. F(x) = (1/sv(2p)) * e^(-(x-?)^2 / (2s^2)).
D. F(x) = p * (1-p)^(x-1.
Togus Bash
STATISTICS
-
Probability Distributions
What is the purpose of the normal approximation to the binomial distribution when n is large and p is close to 0
A. To simplify calculations.
B. To make the binomial distribution discrete.
C. To make the binomial distribution continuous.
D. To make the binomial distribution skewed.
Togus Bash
STATISTICS
-
Probability Distributions
In a Poisson distribution, what is the variance?
A. ?.
B. 1/?.
C. ?^2.
D. v?.
Togus Bash
STATISTICS
-
Probability Distributions
What is the relationship between the normal and lognormal distributions?
A. Lognormal distribution is the logarithm of a normal distribution.
B. Normal distribution is the logarithm of a lognormal distribution.
C. There is no relationship between the two distributions.
D. Lognormal distribution is always normal.
Togus Bash
STATISTICS
-
Probability Distributions
In a hypergeometric distribution, what is the variance?
A. n * (N-n) * (N-n-1) / (N^2 * (N-1)).
B. n * (N-n) / N.
C. n * p * (1-p).
D. n * (1-p).
Togus Bash
STATISTICS
-
Probability Distributions
What is the purpose of the Poisson approximation to the binomial distribution when n is large and p is small?
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.
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STATISTICS
Inferential Statistics
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Statistics
? means here λ.