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Vocab/ Mult. Ch.
Vocab/ Mult. Ch.
Free Response/ Vocab
Free Response/ Vocab
Free Response/ MC
100
A sample that consists of the entire population
What is a Census?
100
What electrical changes occur in muscles as they get tired? Student subjects hold their arms above their shoulders as long as they can. Meanwhile, the electrical activity in their arm muscles is measured. This is.. A) Uncontrolled Exp. B) Randomized comparative ex. C) Matched pairs
What is A
100
A flour company in MI wants to know what percent of local households bake at least twice a week. A company rep calls 500 households during the daytime and finds 50% of them bake at least twice a week. This type of bias is...
What is Undercoverage?
100
We wish to draw a sample of size 5 without replacement from a pop of 50 households. Suppose the households are numbered 01, 02.., 50 and that the relevant line of the random number table is 11362 35692 96237 90842 46843 62719 64049 Then the households selected are?
11, 36, 23, 08, 42
100
Suppose there are 500 students in you school. Starting with the below random digits table, select the first 5 students in an SRS of 20 students. 96746 12149 37823 71868 18442 35119 62103 39244
461, 214, 235, 119, 033
200
Choosing individuals who are easiest to reach. A) Random Sampling B) Convenience sampling C) Strata D) Nonresponse bias
B) Convenience sampling.
200
The Community Intervention Trial for Smoking Cessation (COMMIT) asked whether a community-wide advertising campaign would reduce smoking. The researchers located 11 pairs of communities that were similar in location, size, eco status... One community in each pair participated in the ad campaign and 1 didn't. This is...
What is Matched Pairs
200
randInt(1,9,3) means?
What is the calculator command for generating 3 random numbers from 1 to 9?
200
Inaccurate data accrued due to attitude of respondent, question phrasing, or the manner in which an interview was conducted
What is response bias?
200
Which is CORRECT? A) We don't need to randomize if our sample size is very large. B) A large SS always ensures our sample is rep of the pop. C) If all other things are equal, we need a lager SS for a larger pop. D) In a properly chosen sample, an estimate will be less variable with a large SS and hence more precise.
D
300
The method used for improving the accuracy of a sample.
What is large sample sizes?
300
A nutritionist wants to study the effect of storage time (6, 8, 12 months) on the amy of Vit. C present in freeze dried fruit when stored for these lengths of time. Vit C is measures in mg/100mg of fruit. Six fruit packs were randomly assigned to each of the three storage times. What are TREATMENT, EXPERIMENTAL UNIT, AND RESPONSE respectively?
Specific storage time, fruit pack and amt of Vit C.
300
This experimental design involves the random assignment of units to treatments which are carried out separately within each group of units known to be similar in some way that is expected to affect the responses.
What is block design?
300
A recent survey by a large-circulation Canadian magazine on the contribution of universities to the economy was circulated to 394 ppl who the magazine decided" are the most likely to know how important universities are to the Canadian economy". The main problem with using these results to draw conclusions about the general public's perception is this type of bias: A) Selection bias B) No control group C) nonresponse bias D) interviewer bias
A
300
A committee on community relations in a college town plans to survey local businesses about the importance of students as customers. From telephone book listings, the committee chooses 150 businesses at random. Of these, 73 return the questionnaire mailed by the committee. The pop for this study is:
All businesses in the college town.
400
The design is biased if...
What is when certain outcomes are systematically favored?
400
An experiment to measure the effect of giving growth hormones to girls affected by Turner's Syndrome was carried out recently in Vancouver. All 34 girls in the study were given the growth hormone and their heights were measured at the time the hormone was given and again one year later. No measurements were made on their final adult heights. Which of the following is not problem with the experiment? A) No blinding B) No control group C) Nonresponse Bias D) Insufficient attention to the placebo group?
What is C
400
The 3 basic principles of experimental design.
What are control, randomize, and replicate?
400
To test the effects of a new fertilizer, 100 pilots were divided in half. Fertilizer A is randomly applied to one half, and B to the other. This is an example of an: A) Observational Study B) Match Pairs Exp. C) Completely randomized exp. D) Block Design
D) What is Block Design...They cut them in half BEFORE doing randomization.
400
Does ginkgo improve memory? The aw allows marketers of herbs to make health claims that are not supported by evidence. Brands of ginkgo extract claim to "improve memory and concentration". A randomized experiment found no evidence of such effects. The subjects were 230 healthy people over 60. They were randomly assigned to ginkgo or placebo. All subjects took tests for learning and memory before and six weeks after treatment. What are response and explanatory variables?
Ex: Ginkgo vs placebo, Resp: strength of memory
500
Control groups are used in experiments in order to...
What is to control effects of outside variables on the outcome?
500
A political pollster seeks info about the proportion of american adults who oppose gun control. He asks an SRS of 1000 American adults: "Do you agree or disagree with the following statement: Americans should preserve their constitutional right to keep and bear arms." A total of 910 or 91% said "Agree". The type of bias in this sample is....
what is Question Wording
500
The four steps of an SRS?
1. Label 2. Table 3. Identify Stopping Rule 4. Identify Sample
500
A class in marketing designs two videos advertising an expensive Mercedes sports car. They test the videos by asking fellow students to view both (in random order) and say which makes them more likely to buy the car. Mercedes should be reluctant to agree that the video favored in this study will sell more cars because: A) No control group B) No placebo C) The study used a Matched Pairs design. D) This isn't an experiment E) Results from students may not generalize to the older/richer customers who might buy a Mercedes.
E
500
Does ginkgo improve memory? The law allows marketers of herbs to make health claims that are not supported by evidence. Brands of ginkgo extract claim to "improve memory and concentration". A randomized experiment found no evidence of such effects. The subjects were 230 healthy people over 60. They were randomly assigned to ginkgo or placebo. All subjects took tests for learning and memory before and six weeks after treatment. The study was Double Blind, what does that mean?
The subjects didn't know what treatment they were receiving and the examiners didn't know who go what treatment.