6.111 General health survey. The Centers for Disease Control and Prevention (CDCP) in Atlanta, Georgia, conducts an annual survey of the general health of the U. S. population as part of its Behavioral Risk Factor Surveillance System. Using random-digit dialing, the CDCP telephones U. S. citizens over 18 years of age and asks them the following four questions: 1. Is your health generally excellent, very good, good, fair, or poor? 2. How many days during the previous 30 days was your physical health not good because of injury or illness? 3. How many days during the previous 30 days was your mental health not good because of stress, depression, or emotional problems? 4. How many days during the previous 30 days did your physical or mental health prevent you from performing your usual activities? identify the parameter of interest for each question."

Rate of return, standard deviation, coefficient of variation personal finance problem mike is searching for a stock to include in his current stock portfolio. he is interested in hi-tech inc.; he has been impressed with the company's computer products and believes hi-tech is an innovative market player. however, mike realizes that any time you consider a technology stock, risk is a major concern. the rule he follows is to include only securities with a coefficient of variation of returns below 1.07. mike has obtained the following price information for the period 2015 through 2018:hi-tech stock, being growth-oriented, did not pay any dividends during these 4 years. a. calculate the rate of return for each year, 2015 through 2018, for hi-tech stock. b. assume that each year's return is equally probable and calculate the average return over this time period. c. calculate the standard deviation of returns over the past 4 years. (hint: treat this data as a sample.) d. based on b and c determine the coefficient of variation of returns for the security. e. given the calculation in d what should be mike's decision regarding the inclusion of hi-tech stock in his portfolio?