Exam 1: Data Collection

Determine whether the quantitative variable is discrete or continuous. -the cholesterol levels of a group of adults the day after Thanksgiving

Identify the type of sampling used. -Every fifth adult entering an airport is checked for extra security screening. What sampling technique is used?

Determine what type of observational study is described. Explain. -Researchers wanted to determine whether there was an association between city driving and stomach ulcers.They selected a sample of 900 young adults and followed them for a twenty-year period. At the start of thestudy none of the participants was suffering from a stomach ulcer. Each person kept track of the number ofhours per week they spent driving in city traffic. At the end of the study each participant underwent tests todetermine whether they were suffering from a stomach ulcer. The researchers analyzed the results todetermine whether there was an association between city driving and stomach ulcers.

Identify the type of sampling used. -An education researcher randomly selects 60 of the nationʹs junior colleges and interviews all of the professorsat each school. What sampling technique was used?

Select a random sample of five state capitals from the list below using the two digit list of random numbersprovided. Begin with the uppermost left random number and proceed down each column. When a column iscomplete, use the numbers at the top of the next right column and proceed down that column.State Capitals 1 Abany, NY 11 Charleston, WV 21 Hartford, CT 31 Madison, WI 41 Richmond, VA 2 Annapolis, MD 12 Cheyenne, WY 22 Helen, MT 32 Mortgomery, AL 42 Sacramento, CA 3 Atlanta, GA 13 Columbia, SC 23 Honolulu, HI 33 Mortpelier, VT 43 Salem, OR 4 Augusta, ME 14 Columbus, OH 24 Indianapolis, IN 34 Nashville, TN 44 Salt Lake City, UT 5 Austin, TX 15 Concord, NH 25 Jacksor, MS 35 Oklahoma City, OK 45 Santa Fe, NM 6 Baton Rouge, LA 16 Derver, CO 26 Jefferson City, MO 36 Olymrpia, WA 46 Springfield, IL 7 Bismarck, ND 17 Des Moines, IA 27 Juneau, AK 37 Phoenix, AZ 47 St. Paul, MN 8 Boise, ID 18 Dover, DE 28 Lansing, MI 38 Piere, SD 48 Tallahassee, FL 9 Bostor, MA 19 Frankfort, KY 29 Lincoln, NE 39 Providence, RI 49 Topeka KS 10 Carson City, NV 20 Hamsbur, PA 30 Little Rock, AR 40 Raleigh, NC 50 Trenton, NJ Random Numbers 46 81 17 60 92 59 40 9 53 78 45 14 53 78 8 43 3 99 46 86 41 42 36 95 39 14 16 59 84 18 5 48 45 41 77 91 11 43 76 28

A farmer wishes to test the effects of a new fertilizer on her soybean 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 soybean yield is recorded for each section of land.What is the treatment in this experiment?

A drug company wanted to test a new indigestion medication. The researchers found 700 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. What is the treatment in this experiment?

What is a factor?

Determine the level of measurement of the variable. -height of a tree

Determine the level of measurement of the variable. -a studentʹs favorite sport

Determine whether the quantitative variable is discrete or continuous. -the number of phone calls to the police department on any given day

A student is asked to rate a guest speakerʹs ability to communicate on a scale of poor-average-good-excellent.The student is to fill in a corresponding circle on a bubble form. This is an example of collecting what type ofdata?

A medical journal published the results of an experiment on insomnia. The experiment investigated the effectsof a controversial new therapy for insomnia. Researchers measured the insomnia levels of 92 adult women whosuffer moderate conditions of the disorder. After the therapy, the researchers again measured the womenʹsinsomnia levels. The differences between the the pre- and post-therapy insomnia levels were reported. What isthe treatment in this experiment?

Determine whether the study depicts an observational study or an experiment -A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 95 people to atreatment group and 95 to a placebo group. The treatment group receives a medication over a period of threemonths and the placebo group receives a placebo over the same time frame. At the end of three months thepatientsʹ symptoms are evaluated.

Determine whether the quantitative variable is discrete or continuous. -the age of the oldest employee in the data processing department

A medical journal published the results of an experiment on insomnia. The experiment investigated the effectsof a controversial new therapy for insomnia. Researchers measured the insomnia levels of 40 adult women whosuffer moderate conditions of the disorder. After the therapy, the researchers again measured the womenʹsinsomnia levels. The differences between the the pre- and post-therapy insomnia levels were reported. Whattype of experimental design is this?

An international relations professor is supervising four masterʹs students. Information about the students issummarized in the table. Student Name Student Number Area of Interest GPA Anna 914589205 Africa 3.63 Pierre 981672635 Middle East 3.30 Juan 906539012 Latin America 3.16 Yoko 977530271 Asia 3.68 Identify the variables and determine whether each variable is quantitative or qualitative.

Determine the level of measurement of the variable. -an evaluation received by a physics student (excellent, good, satisfactory, or poor).

Determine the level of measurement of the variable. -the native language of a tourist

Identify the type of sampling used. -In a recent online survey, participants were asked to answer ʺyesʺ or ʺnoʺ to the question ʺAre you in favor ofstricter gun control?ʺ 6571 responded ʺyesʺ while 4137 responded ʺnoʺ. There was a fifty-cent charge for thecall. What sampling technique was used?