Statistics and Probability Answers

In which of the following methods of sampling the population is divided into groups so that the elements in each group are homogeneous and the groups vary from each other ?

a. judgmental sampling

b. stratified sampling

c. systematic sampling

d. cluster sampling

e. random sampling

If a sample of size 38 is collected from finite population of 600, then the finite population correction factor is equal to

The possible outcomes favorable for an event and the total number of outcomes are known without performing the experiment in case of

a. classical probability

b. marginal probability

c. relative probability

subjective probability

None of the above

Which of the following measures of central tendency s affected by extremely large or small items in a data set?

a. median

b. quartile

c. mean

d. mode

e. percentile

The coefficients 'a' and 'b' of a simple regression line are 12 and 1.3 respectively. What will be the estimated value of the dependent variable if the independent variable is equal to 22?

There are 16 questions each with 5 multiple choices. What is the probability of answering exactly 7 questions correctly?

If the variables x resembles same as variable Y, then the covariance between the two variables reduces to:

a. the covariance of either variables

b. the correlation of either variables

c. the standard deviation of either variables

d. the variance of either variables

e. the expected value of either variables

the mean of a binomial distribution is 8 and variance is 3.4. The probability of success is

Which of the following is true with regard to a given coefficient of correlation and its corresponding coefficient of determination?

a) the coefficient of determination is always greater than or equal to zero, and less than or equal to 1

b) the coefficient of determination is always less than zero

c) the coefficient of determination is always equal to 1

d) the coefficient of determination always has the same sign as the coefficient of correlation

e) the magnitude of coefficient of determination is always higher than the magnitude of coefficient of correlation.

A regression relationship has been established between two variables X and Y, in which X is the independent variable. The coefficient of correlation between X and Y is 0.55. What percentage of the variation in Y is not explained by the regression relationship?