Exam 1: Data Collection

The legal profession conducted a study to determine the percentage of cardiologists who had been sued formalpractice in the last three years. The sample was randomly chosen from a national directory of doctors.Identify the individuals in the study.

Classify the variable as qualitative or quantitative. -the bank account numbers of the students in a class

Identify the type of sampling used. -To avoid working late, the plant foreman inspects the first 40 microwaves produced that day. What samplingtechnique was used?

Determine whether the study depicts an observational study or an experiment -The personnel director at a large company would like to determine whether the company cafeteria is widelyused by employees. She calls each employee and asks them whether they usually bring their own lunch, eat atthe company cafeteria, or go out for lunch.

Determine whether the underlined value is a parameter or a statistic. -A study of 3700 college students in the city of Pemblington found that 8% had been victims of violent crimes.

Determine whether the study depicts an observational study or an experiment -A poll is conducted in which professional musicians are asked their ages.

Identify the type of sampling used. -Thirty-five math majors, 29 music majors and 26 history majors are randomly selected from 585 math majors,279 music majors and 393 history majors at the state university. What sampling technique is used?

True or False: Experiments assist the researcher in isolating the causes of the relationships that exist betweentwo variables.

An experiment in which the experimental unit (or subject) does not know which treatment he or she isreceiving is called a ________________ .

Determine whether the quantitative variable is discrete or continuous. -the number of pills in an aspirin bottle

A farmer wishes to test the effects of a new fertilizer on her tomato yield. She has four equal-sized plots ofland-- one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil. She divideseach of the four plots into three equal-sized portions and randomly labels them A, B, and C. The four Aportions of land are treated with her old fertilizer. The four B portions are treated with the new fertilizer, andthe four Cʹs are treated with no fertilizer. At harvest time, the tomato yield is recorded for each section of land.Identify the experimental units.

__________ is a condition applied to the experimental units involved in an experiment.

A farmer wishes to test the effects of a new fertilizer on her potato yield. She has four equal-sized plots ofland-- one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil. She divideseach of the four plots into three equal-sized portions and randomly labels them A, B, and C. The four Aportions of land are treated with her old fertilizer. The four B portions are treated with the new fertilizer, andthe four Cʹs are treated with no fertilizer. At harvest time, the potato yield is recorded for each section of land.How many levels does the treatment have in this experiment?

Parking at a large university has become a very big problem. University administrators are interested indetermining the average parking time (e.g. the time it takes a student to find a parking spot) of its students. Anadministrator inconspicuously followed 180 students and carefully recorded their parking times. Identify thesample of interest to the university administration.

A medical journal published the results of an experiment on anxiety. The experiment investigated the effects ofa controversial new therapy for anxiety. Researchers measured the anxiety levels of 69 adult women who suffermoderate conditions of the disorder. After the therapy, the researchers again measured the womenʹs anxietylevels. The differences between the the pre- and post-therapy anxiety levels were reported. What is theresponse variable in this experiment?

A drug company wanted to test a new arthritis medication. The researchers found 300 adults aged 25-35 andrandomly assigned them to two groups. The first group received the new drug, while the second received aplacebo. After one month of treatment, the percentage of each group whose arthritis symptoms decreased wasrecorded and compared. What type of experimental design is this?

Determine the level of measurement of the variable. -category of storm (gale, hurricane, etc.)

Determine the level of measurement of the variable. -weight of rice bought by a customer

The object upon which the response variable is measured is called ________ .

A drug company wanted to test a new indigestion medication. The researchers found 400 adults aged 25-35and randomly assigned them to two groups. The first group received the new drug, while the second receiveda placebo. After one month of treatment, the percentage of each group whose indigestion symptoms decreasedwas recorded and compared. How many levels does the treatment in this experiment have?