Exam 1: Getting Started

Identify the implied population in the information below. 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).

Use a random-number table to simulate the outcomes of tossing a quarter 20 times beginning at row 5, block 3. Assume that the quarter is balanced (i.e., fair) and an even digit is assigned to the outcome heads (H) and an odd digit to the outcome tails (T). 65321 85623 10204 50218 20321 22315 98532 91972 39800 45670 20510 10451 92012 59826 35456 79289 91483 29754 45652 98653 45863 36963 15326 78952 45678 10100 91251 37041 13712 14672

Use a random-number table to get a list of 10 random numbers between 1 and 99 beginning at row 2, block 2. 65321 85623 10204 50218 20321 22315 98532 91972 39800 45670 20510 10451 92012 59826 35456 79289 91483 29754 45652 98653 45863 36963 15326 78952 45678 10100 91251 37041 13712 14672

Find the technique for gathering data in the study below. An ecology class used binoculars to watch 23 turtles at Lowell Pond. It was found that 18 were box turtles, and 5 were snapping turtles.

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

Identify the variable in the information below. What is the average miles per gallon (mpg) for all new cars? Using Consumer Reports, a random sample of 35 new cars gave an average of 21.1 mpg.

Data may be classified by one of the four levels of measurement. What is the name of the lowest level?

Identify the sampling technique used in the following information. An important part of employee compensation is a benefits package that might include health insurance, life insurance, child care, vacation days, retirement plan, parental leave, bonuses, etc. Suppose you want to conduct a survey of benefits packages available in private businesses in Hawaii. You want a sample size of 100. Sampling technique used to get the sample size of 100 is described below. Use the Island Business Directory. Number all the businesses. Select a starting place at random, and then use every 50th business listed until you have 100 businesses.

Identify the level of measurement corresponding to the data "Gross income for each of the past 5 years" associated with robotics.

Identify whether the variable in the information below is qualitative or quantitative. The archeological site of Tara is more than 4000 years old. Tradition states that Tara was the seat of the high kings of Ireland. Because of its archeological importance, Tara has received extensive study (Reference: Tara: An Archeological survey by Conor Newman, Royal Irish Academy, Dublin). Suppose an archeologist wants to estimate the density of ferromagnetic artifacts in the Tara region. For this purpose, a random sample of 55 plots, each of size 100 square meters, is used. The number of ferromagnetic artifacts for each plot is determined.