Chap 4 test review

In order to asses the effects to exercise on reducing cholesterol, a researches to randomly smple 50 people from...Who are not regulary excerised, they all had cholesterol meashred unaware of purpose. Doctor testity did not know if they did or did not.

A, observational study

A candidate for mayor of Dallas wants to know what proportion of city residents support his candiday. His staff calls 1000 people chose at random from the city telephone directory. 850 respond what are the population and sample in this example?

B) Population: all Dallas residents. Sample the 850 people who respond.

A public opinion poll in ohio wants to determine whether or not resgiterd voter in the state approve of a measure you ban smoking in all public areas. They select a simple random smaple of fifty registered voters from each country in the state and ask whether they approve or disapprove of this measure. This is an example of a,

B) Straftified Random Sample

The brand of pellets is a what kind of variable

C) The explanatory variable

100 volunteers suffer from depression, 50 are selected, and they were evaluated for 4 weeks. The study would be double blind if.

Neither the volunteers nor the psychiatrist knew which treatment any person had received.

12 people suffer chronic fatigue syndrome, 8 are men and 4 are women, half are given shark fins and a block design is appropriate if..

We believe men and women will respond different to treatments

A sportswriter wants to know how stong Lafayette residents support the local minor league baseball team, leopards. She stands outside the stadium before a game and interviews the first 20 people who enter the stadium. The indended population was/

a) All ewsidents of Lafayette

"who do you believe will win election? This question is about Ohio State. Undergraduate student Governemt elections

a) The resuls of the swurvey are unreliable because the reond to the survey was voluntary.

A merkening research firm, wants to determine if adult men in Laramine Wyoming would be interested in a new upscale clothing stores. There was a selected simple random sample of 100 and mails a brief questionnaire to each. THe change that all 1000 homes in a particular neighborhood in Laramine.. Being the sample of residential address selected is

a) The same as for any other set of 100 residetnal addressed.

Exploring the nature of relationship between heart rates and frequency that a person who stepped up and down

a) factors

A local tax refom group polls the residents of the school distric and asks the question " Do you thin the school board should stop spending tax payers money on non-essential art programs in elementary schools?" The results of this pool are likely to.

b) Under estimate suppor for arts programs because of the qaythe question is worded.

A maine biologist wants to estimate the mean size of the barnacle. Semi balances balnold on a stretch of rocky shoreline. To do so, he randomly selected 20, 10 cm sq plots and measured the size of every barnacle in each plot. This is an example of

b) cluster sampling

Want to choose Simple random sample of three people from small company. 1m Benchoter, 2. Brown, 3. Ito. 4. Kesten, 5. Kifer, 6. Spizer, 7. Taylor, 8. Wald, 9. Weiss. Then it gives a line of digits. The Simple random sample is..

c) Bechnofer, taylor, Weiss

If genetic was put into the mix it would suffer from a what?

confounding

Owner supermarkets- positive correlation between beer and ice-cream- Which is a valid conclusion from facts.

d) It is likely that sales of both beer and ice cream are confounded with another variable such as seasonal variation in temperature.

The newspaper asks you to comment on their survey of local opinion you say.

d) This is a convenience sample. It will almost certainly overestimate the level of support among all Lafayette residents.

The principle reason for the use of random assignment in designing experiments is that it..

d) creates approx. equal groups for comparison

Scenario 4-7 is about a farmer and 2 different brands of pellets Kent or Moormans. The Farmer conducted am...

d) experiment, but not a complete randomized experiment

Which of the following statements is true?

d) if we use another list of random digits to select the sample the result obtained with the list actuall used woule be just as likely to be selected as any other set of three names.

Are dogs better at tracking the movements of white objects or red ones. This is an example of..

d) match pairs design.

Frequently, telephone polls takers call near dinner time. Between 6 and 7 pm. becuae most pople are at home. This is an effort to avoid.

d) nonresponse

8) A simple random sample 50 of 816, label 001 to 816. The numbers are 95592 94007 69769 33547 72450 16632 81194 14873 Use scenario, The first three students in your sample have lables

e) 400, 769, 335

The Bradely effect is a theory propsed to explain observed discrepancies between voter opioin pools and election outscomes in some elections where a ehite candidate or a non white candidate run against each other. THe theory proposes that some voters and tend to tell poolsters that they are undecided or likey to vote for a non white candidate, and yet on elections day vote for the white opponents. THis is an example of

e) response Bias

important at (blank) is

experiments can give better evidence of causation