ELEMENTS OF STATISTICS
Q.1
By whom and when the Poisson distribution was developed?
Ans.
S.D. Pearson in 1837.
Q.2
The mean and variance of Binomial distribution is given by
Ans.
Mean=np, Variance=npq.
Q.3
The mean and variance of Poisson distribution are
Ans.
equa (both equal tone).
Q.4
In Bernauli trails all trails have
Ans.
Equal probability.
Q.5
The experimental design for fertility gradient of land in two directions is
Ans.
Least square design.
Q.6
Out of the two kinds of error in sampling, which one is more serious?
Ans.
Type II error.
Q.7
Positively and negatively skewed distributions are also known as
Ans.
Right skewed and left skewed respectively.
Q.8
By whom the term null hypothesis was first coined?
Ans.
Ronald Fisher.
Q.9
The test whether the theory fits well in practical can be judged by
Ans.
x² test (Chi-square).
Q.10
Who introduced the concept of alternative hypothesis?
Ans.
Jerzy Neyman and Egon Pearson.
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