QUESTION 1 A placebo is an inert substance. True False 1 points QUESTION 2 You h

Question

QUESTION 1

A placebo is an inert substance.

True

False

1 points   

QUESTION 2

You have just learned of survey results conducted by your university on the drinking behaviors of the college campus. Wondering about the results, you ask yourself the following questions: how were participants selected, were participants selected depending on if they lived on- or off-campus, were all the participants in a sorority or fraternity, were non-traditional age students included in the survey, and were men and women equally sampled? These types of questions indicate that you are concerned about what threat to internal validity?

history

selection

maturation

regression to the mean

1 points   

QUESTION 3

Alcohol free Jell-O shots are a placebo.

True

False

1 points   

QUESTION 4

When using __________________, the probability of being selected for participation changes with each selection of a participant.

sampling without duplication

sampling with replacement

sampling without replacement

sampling with duplication

1 points   

QUESTION 5

Which of the following methods could be used in a simple probability sampling procedure?

pulling names of potential participants from a hat

placing people into groups as they enter an experiment

systematically separating the males from the females

identifying participants before the experiment starts

1 points   

QUESTION 6

Selection of participants is not a threat to internal validity.

True

False

1 points   

QUESTION 7

The four types of probability sampling procedures include : simple, stratified, systematic, and cluster.

True

False

1 points   

QUESTION 8

By using ______________________, each selection in a study has exactly the same probability of being selected for participation.

sampling without duplication

sampling with replacement

sampling without replacement

sampling with duplication

1 points   

QUESTION 9

Nuisance variables are not controlled for by the researcher.

True

False

1 points   

QUESTION 10

Which of the following methods could be used in a simple probability sampling procedure?

placing people into groups as they enter an experiment

systematically separating the males from the females

using a random number table to put participants in groups

identifying participants before the experiment starts

1 points   

QUESTION 11

_________ variables are not controlled for in the experiment but may have an influence on the dependent variable because they vary with the levels of the independent variables.

Extraneous

Nuisance

Attrition

History

1 points   

QUESTION 12

Many colleges and universities offer a freshman seminar class to prepare students for college life. Colleges put a great deal of money into these classes and want to know if the freshman seminar classes (the independent variable) have an influence on the students' attitudes and behaviors (the dependent variable). This is commonly measured by conducting a survey at the end of the first year about information covered in the classes. Which of the following threats to internal validity could influence survey results?

history

regression to the mean

maturation

selection

1 points   

QUESTION 13

The two main sampling techniques that researchers use are ________________ sampling and ________________ sampling.

probability, population

population, quota

probability, nonprobability

quota, nonprobability

1 points   

QUESTION 14

According to the text ________________ is to nonprobability sampling as __________________ is to probability sampling.

quota, snowballing

convenience, simple

simple, stratified

cluster, snowballing

1 points   

QUESTION 15

Samantha is conducting a survey to evaluate the eating habits of customers at fast food restaurants. She select the first 50 customers during the day as her participants. Samantha is using a(n) _________________ sample.

cluster

probability

biased

simple

1 points   

QUESTION 16

The amount of overlap between populations being studied is called ________________.

power.

sample size.

population density.

effect size.

1 points   

QUESTION 17

Aaron has just finished collecting data for his study. He has a total of 85 participants. The number of participants in his study is known as the ________________.

population collective.

data sample.

population.

sample size.

1 points   

QUESTION 18

After analyzing her data, Faith has found that her power level for her analyses is .80. Faith's power is considered to be ___________________.

low

adequate

very low

extremely high

1 points   

QUESTION 19

The number of individuals that are selected to participate or that participate in a study is known as the ____________________.

population density.

sample number.

sample size.

population size.

1 points   

QUESTION 20

Lindsey is analyzing her data. For her analysis, what level of power should she try to achieve?

.50

.80

.90

.75

1 points   

QUESTION 21

Threats to internal validity are threats to saying __________.

the independent variable caused the change in the dependent variable.

the dependent variable caused the change in the independent variable.

the results can be generalized to other populations.

the results are due to chance.

1 points   

QUESTION 22

A sample is a smaller group of individuals that is representative of the larger population.

True

False

1 points   

QUESTION 23

While researchers can reduce placebo effects through double-blind procedures, researchers cannot reduce demand characteristics.

True

False

1 points   

QUESTION 24

Which of the following researchers outlined threats to internal validity many years ago?

Shadish, Cook, and Campbell

Campbell and Stanly

Stanly and Cook

Shadish and Stanly

1 points   

QUESTION 25

Threats to internal validity are threats to saying the independent variable caused the change in the dependent variable

True

False

1 points   

QUESTION 26

Stratified sampling is a probability sampling technique where a researcher begins by identifying subgroups and then randomly samples from each subgroup.

True

False

1 points   

QUESTION 27

Which of the following is not one of the types of probability sampling procedures?

simple

snowballing

systematic

stratified

1 points   

QUESTION 28

A single blind study is preferred over a double blind study.

True

False

1 points   

QUESTION 29

In the Are You Equipped Now at the end of the chapter, attrition occurred because 11% of participants had already received acupuncture that year.

True

False

1 points   

QUESTION 30

There is no known relationship between the sample size of a study and the ability of statistical tests to determine an effect.

True

False

True

False

Explanation / Answer

Answer: True

Explaination: Placebo is an inert substance as it is a dummy medicine usually containing sugar, starch or saline which has no effect on the body.

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