ANS: The parameter, representing a statistical characteristic of the population, is a constant for the given population, but, the statistic, representing a statistical characteristic of the sample, is a variable.

ANS: The standard deviation of distribution of mean fiber length is the standard error of mean fiber length.

ANS: It is practically impossible to numerically identify each individual of a population either because of the large size of the population or because of the inaccessibility or current non-existence of some of the individuals, therefore, it is not possible to obtain a simple random sample as defined.

ANS: This is said so because as the sample size increases, the standard deviation of sample mean (that is, standard error of sample mean) reduces.

ANS: While calculating the sample variance, the divisor should be n, and this is known as a biased estimator of population variance. But, when the divisor is n-1, the resulting expression is known as an unbiased estimator of population variance.

ANS: One-tailed test.

Ans: Two-tailed test.

ANS : Yes