AP Sats test 4 – Flashcards
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the HEMLOCK WOOLLY ADELGID id an INSECT that has accidentally been released in Eastern U.S. forest from Asia. It would be appropriet to generalize the results of the study to
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all Hemlock trees in the forest from which 200 TREES WERE SELECTED
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which of the following is a mehod for improving the accuracy of a sample?
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Use a LARGE sample size
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we say that the design of a study is BIASED if hich of the following is true?
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Certain outcomes are systematically favored
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a sample of STUDENT opinion at a BIG TEN UNIVERSITY selects an SRS of 200 of the 30,000 UNDERGRAD students. this kind of sample is called a:
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STRATIFIED RANDOM SAMPLE
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a recen survey by a large-circulation CANADIAN MAGAZINE on the contribution of universities to the economy. the main problem with using these results to draw conclusions about the GENERAL PUBLIC'S PERCEPTION is
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lack of RANDOM SELECTION
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for a certain experiment you have 8 subject. 4 males = ATWAER, BACON, CHU, DIAZ. 4 females = KING LIU,MOORE, JOHNSON
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ATWATER, BACON, CHU, JOHNSON
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a TEXAS SCHOOL district wants to compare the effectivness of a standard AP Statistics curriculum and a new "hands-on" AP STATS CURRICULUM. 2 teachers, four classes. at the end of the year, all students take the AP exam. the SUBJECTS of the experiment are
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the students in the FOUR classes
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the TEXAS EXPERIMENT described in the previous questtion has two factors:
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two factors: the TYPE of AP stats CURRICULUM and the TEACHER
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a MATERIAL ENGINEER wishes to compare the durability of 2 different types of paving material. she has 40 different ONE MILE stretches of INTERSTATE highway.
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Let each of the 40 ROADWAYS act as its OWN PAIR, dividing each roadway in HALF...
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an article in the STUDENT NEWSPAPER of a large universite headlines A's SWAPPED FOR EVALUATIONS? Results showed that higher grade directly corresponded to a more positive evalutation
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Teachers of courese in which the MEAN grade is ABOVE average APPARENTLY tend to have above average teaching evaluations
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what ELECTRICAL changes occur in MUSCLES as they get tired? students hold their arms above their shoulders as long as they can.
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this is an UNCONTROLLED EXPERIMENT
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which of the following statements is FALSE?
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Sophisticated statistical methods can ALWAYS CORRECT the reulsts if the population you are sampling from is different from the population of interest, for example due to undercoverage
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an experiment to measure the EFFECT of giving GROWTH HORMONES to Girls affected by TURNER;S SYNDROME was carried out recently. all 34 gils in the study were given and measured A YEAR LATER. which is NOT a problem?
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NONRESPONSE BIAS
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A CIVIL ENGINEER is testing the RELIABILITY of TRAFFIC SIGNAL CONTROLLERS produced by two different companies. he has 20 sets of controllers from each company, and he has been given clearance to install them at 40 different intersections in the city. The most important reason for Random Assignment is that
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Randomization is a good way to create two groups of 20 intersections that are as similar as possible, so that comparisons can be made between the two groups
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to test the effects of a NEW FERTILIZER, 100 plots were divided in Half. FERTILIZER A is randomly applied to one half, and B to the other. that is
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A MATCHED PAIRS EXPERIMENT
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an AIRLINE that wants to assess CUSTOMER SATISFACTION chooses a Random Sample of 10 of its FLIGHTS during a SINGLE month and asks them to fill out a survey. This is an example of
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Cluster Sample
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you work for an ADVERTISING AGENCY that is preparing a new television COMMERCIAL to appeal to women....Because of these differences, you should use:
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a BLOCK DESIGN
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According to the 1990 CENSUS, those states with an average number of people X, who fail to complete high school tend to have an above average INFANT DEATHS, Y. the most plausible explanation for the POSITIVE association between DROPOUTS and BABY DEATHS is:
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LURKING VARIABLES are probably present. Ex: states with larger populations may have both larger numbers of people who don't complete high school and baby deaths
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80 volunteers who use an Over-The-Counter ALLERGY MEDICATION have been recruited to participate in a trial of a new ALLERGY medication. Volunteers are randomly assigned, each is asked after two weeks. which of the following best describes a conclusion that can be drawn from this study?
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we CAN determine whether the new drug REDUCES symptoms MORE than the old DRUG for THE SUBJECTS of THIS study
