a. Data on the unemployment rates in different parts of a country during a year. b. Data on the consumption of wheat by 200 households during a year. c. Data on the gross domestic product of a country over a period of 10 years. d. Data on the number of vacancies in various departments of an organization on a particular month. 17. Which of the following refers to panel data? a. Data on the unemployment rate in a country over a 5-year period b. Data on the birth rate, death rate and population growth rate in developing countries over a 10 -year period. c. Data on the income of 5 members of a family on a particular year. d. Data on the price of a company's share during a year. 18. An outlier that is much larger than the remaining values in a series causes the distribution to be a. skewed to left b. skewed to right c. symmetric d. kurtosis 19. The covariance a. measures the linear relationship between two random variables c. must be positive d. measures the tightness of the relationship between two variables 20. The correlation coefficient must be positive b. must be negative c. must fall between 1 and 1 d. must fall between 0 and 1