# Statistics: Variance and Vanguard Total Stock

Topics: Variance, Standard deviation, Index fund Pages: 3 (641 words) Published: January 6, 2012
Statistics Midterm paper
1. : Identify the implied population in the information here.

Government agencies carefully monitor water quality and its effect on wetlands (Reference: Environment Protection Agency Wetland Report EPA 832-R-93-005). Of particular concern is the concentration of nitrogen in water draining from fertilized lands. Too much nitrogen can kill fish and wildlife. Twenty-eight samples of water were taken at random from a lake. The nitrogen concentration (milligrams of nitrogen per liter of water) was determined for each sample. The variable in this information is nitrogen concentration (mg nitrogen/l water).

a. number of fish
b. samples of water taken at random
c. the wetlands
d. nitrogen concentration (mg nitrogen/l water) in the entire lake e. government agencies

2. Find the technique for gathering data in the study below.

A study of all league football scores attained through touchdowns and field goals was conducted by the National Football League to determine whether field goals account for more scoring events than touchdowns (USA Today).

a. sampling
b. census
c. experiment
d. simulation
e. observational study

3. It's not an easy life, but it's a good life. Suppose you decide to take the summer off and sign on as a deck hand for a commercial fishing boat in Alaska that specializes in deep-water fishing for ground fish. What kind of fish can you expect to catch? One way to answer this question is to examine the reports on ground fish caught in the Gulf of Alaska. The following list indicates the types of fish caught annually in thousands of metric tons: flatfish, 36.3; Pacific cod, 68.6; sablefish, 16.0; Walleye Pollock, 71.2; rockfish, 18.9. Make a Pareto chart showing the annual harvest for commercial fishing in the Gulf of Alaska.

4. How hot does it get in Death Valley? Assume that the following data are taken from a study conducted by the National Park System, of which Death Valley is a unit. The ground...