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1. A market research company wishes to find out whether the population of students at a university prefers brand A or brand B of instant coffee. A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa (with the order determined at random). They then indicate which brand they prefer. The response variable is
A. whether brand A or B is tried first.B. which brand they prefer.C. the two brands of coffee.
2. A researcher is interested in the cholesterol levels of adults in the city she lives in. A free cholesterol screening program is set up in the downtown area during the lunch hour. Individuals can walk in and have their cholesterol determined for free. One hundred and seventy-three people use the service and their average cholesterol is 217.8. The sample obtained is an example of
A. a simple random sample since the experimenter did not know beforehand which individuals would come to the screening.B. a stratified sample of high and low cholesterol individuals.C. a sample probably containing bias and undercoverage.
3. A sample was taken of the salaries of four employees from a large company. The following are their salaries (in thousands of dollars) for this year.
33 31 24 36
The variance of their salaries isA. 5.1.B. 26.C. 31.
Consider the following time plot of the values of variable Y for each month of a 60-month period. This plot displays
Calculate descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Calculate the value of beta for each stock.
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
Suppose we drew a histogram of these 18 death rates using class intervals 1 — 1.9, 2 — 2.9, 3 — 3.9, 4 — 4.9 and 5 — 5.9. Using the histogram, we would
MATH1550H: Assignment: Question: what is the least number of applicants that should be interviewed so as to have at least 50% chance of finding one such secretary?
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
What is the probability that they all hit the target?
Solve the equations using linear algebra
Suppose the probability of the worst-case scenario increases Compute the expected value of perfect information
Solve linear program graphically
Support colour-coding on packaged food to indicate healthier options
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