ELEMENTS OF STATISTICS
Q.1
Who gave the definition of mathematical probability ?
Ans.
Von-Mises.
Q.2
By deterministic phenomena, we mean that results can be predicted with
Ans.
Certainty.
Q.3
For two independent events A and B, the conditional probability P (A/B)
Ans.
A.
Q.4
When do two random variables are said to be independent ?
Ans.
When cov(X, Y)=0.
i.e. correction coefficient r=0.
Q.5
If X follows a binomial distribution with parameter n and p, then what is the distribution of (n–X) ?
Ans.
Bionomial distribution with parameter n and q.
Q.6
The normal distribution was discovered by____.
Ans.
De-Moivre.
Q.7
If X is normally distributed with zero mean and unit variance, then mean and variance of X² equal to
Ans.
1 and 2.
Q.8
What to does β in the regression equation γ=α+βx+γ indicate ?
Ans.
Slope of the line.
Q.9
Predictor variables are also known as
Ans.
Independent variable.
Q.10
Response variables are also known as
Ans.
Dependent variable.
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