Q1) Generally speaking, if two variables are unrelated (as one increases, other shows no pattern), covariance between the variables will be:

a) Large positive number.

b) Large negative number.

c) Positive or negative number close to zero.

d) None of the above.

2) Which of given statements regarding binomial experiment is not true, where n is number of trials, and p is probability of success in each trial?

a) The n trials are independent.

b) The standard deviation is np(1 - p).

c) The mean is np.

d) There are only two possible outcomes.

Q3) Which of given is the example of binomial experiment?

a) Shopping mall is interested in income level of its customers and is taking a survey to collect information.

b) Business firm introducing new product wishes to know how many purchases its clients will make each year.

c) Sociologist is researching the area in effort to find out proportion of households with male head of household.

d) Study is concerned with average number of hours worked by high school students.

Q4) Which of the given experiments can be modelled by Poisson distribution?

a) Number of calls received by a switchboard during a given period of time.

b) Number of bacteria per small volume of fluid.

c) Number of customer arrivals at checkout counter during given minute.

d) All of the above.