What is an infectious disease? a. a disease such as cancer or heart disease that is not transmitted from one person to another b. any disease that is transmitted through direct person-to-person contact, by an animal that is infected, or through the environment c. a condition that develops in a baby during the mother's pregnancy or at birth d. a disease of the heart or blood vessels, such as hypertension, heart attack, and stroke

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?