stats in psych Chapter 1

Descriptive statistics

A librarian at a university is interested in looking at how many undergraduate students use the library. He records student use of different library resources and tabulates this usage. This information is an example of

Inferential statistics

A librarian at a university is interested in looking at how many undergraduate students use the library. He records student use of different library resources in one month and extrapolates this information for the year-round usage. This is an example of

Nominal scale

Data from airline passengers were ranked by their country of origin, an example of a

Students were asked to rate the effectiveness of video lectures for an online class. Their ratings on a 5-point scale would be

Discrete and quantitative

Descriptive statistics can help to infer the unknown parameters in a population.

False

High School GPA and score on the SAT exams are considered during college admissions. Both these values are continuous and quantitative measurements.

False

In an ordinal scale, a larger number represents a greater value than a smaller number, and the ratio of any two numbers represents a meaningful value

False

An Interval scale

In blinded studies, consumers' rankings of the effectiveness of brand name painkillers did not differ from generic painkillers that had the same key ingredients, on a 5-point scale. The scale used in these studies is

Correlational method

Is children's vocabulary related to their parents' education level? To answer this, researchers measured the number of words 3-year-old children knew, and their parents education (in number of years). This data can be examined using

Ordinal scale

Listeners to a specific radio station were asked to rank one hundred songs for popularity. The composite rank score for the songs were then published, and shows use of a

A librarian at a university is interested in looking at how undergraduate students use the library resources. He sends a survey about the library usage to all undergraduate students in the college but receives responses from only a subset of students. In this example, the librarian was interested in getting information from the ______________, but could obtain only a _____________.

Population; sample

A researcher studies the development of cognitive flexibility by testing children of different age groups on a problem-solving task. This is an example of a:

Quasi-experimental method

Experimental method

Randomly assigning to different groups to ensure that manipulations of the independent variable are measured on similar groups is necessary in:

Random assignment is not possible in a quasi-experiment because the variables being studies cannot be manipulated.

True

A continuous variable is measured along a continuum at any place beyond the decimal point, and can be positive (e.g., height) or negative (e.g., temperature) in value.

true